Malicious PDF — malware analysis report

Static analysis result for SHA-256 5752791bbc14e41d…

MALICIOUS

PDF

58.3 KB Created: 2020-10-18 09:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 247c880a00520e4af4b3ecddb92881b0 SHA-1: 3f74beae96f2fec76c064ee0e1d0fe1d0f92a818 SHA-256: 5752791bbc14e41dd2ff65425595e30856db316417ac1ce86fa57eed8d40f561
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body and embedded links suggest a lure for downloading software, specifically mentioning 'psiphon 108 handler ui apk download'. The presence of multiple links and the nature of the primary malicious URL indicate an attempt to redirect the user to a potentially harmful download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/123?keyword=psiphon+108+handler+ui+apk+download In PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/nukagibamawot.pdfIn PDF document text
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/jemapene-pajemopiw-tenorunep.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/kuzofevoj-padisiriteme.pdfIn PDF document text
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/5768239.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/7d76ce9.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/xowirokagejewu_xorikuno_tidipawane_xorisomeni.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/bewomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3fdd1afb-e2f9-441a-81d9-1420487bef36/43376099976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cbe504-fd5b-492f-adfe-e3b34cf96786/95858294127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661eac77-e3a2-4d23-945d-1972fa1bbc69/73802710613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68307b96-2007-4aae-b75d-23ec4567e109/motojakirudezubebobet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7751f9-7c11-4f3b-8702-505bb89887c6/55141467571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8610f6f6-2ba3-45d1-b703-3c45d7b669bb/19752895131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a74fbd1-8934-4472-b9a8-cdfe9ba77a2a/rejapokeluvuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755cf753-8d9f-45e5-8f10-d2a2827f3345/klipsch_r6i_ii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb719322-5075-4a94-93ca-3effa7a63047/gekib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee4bed2-16f8-4a39-8d43-1a84e5ddb112/87826220958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8bde8c-c399-4eb4-9d37-954543ba1162/audio_router_windows_10_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6ed917-4d32-417a-8bcd-a9d9097a5566/39203730428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f9d91c-26f4-4f58-b2fd-15a423d2dd17/80226970855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7667121f-ce65-4297-8f59-8859eaa5f324/97316605870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f7d7d2-6274-44fd-a179-95d8e4f02535/patodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6160f41-9226-44c5-b8fa-5ffc45dda28b/56309672768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99f7eca-cbd7-481c-b3f1-46f36b362d6f/21851481532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a2476f-9a84-4036-9d40-90522848129c/jezalusigemosemexuwet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000602f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602F 12712 bytes
SHA-256: d5cb307ac469e748ca9ee3ab9f854fc4786124b4dfc556e40555ef9a4c5da2d5
font_01_sfnt_off00008947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8947 5396 bytes
SHA-256: 4ff4267ebfce570b9b7016023a566d78be20c44657f8c92dbdd5d80cbf7f2e99
font_02_sfnt_off00009b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B8A 14988 bytes
SHA-256: a382f557f9eb9005e97037d019f59edd9c4ada46d63ef49a22d3677318cc7a92
font_03_sfnt_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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