Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f22573da9b25152…

MALICIOUS

PDF

81.0 KB Created: 2021-03-09 23:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b21798b1a043d4790ad4632e3251e7a9 SHA-1: 287222a215e92c31d18c778ca3d74f66d06a4f96 SHA-256: 9f22573da9b25152c68073b0c6d2c72c8fa20bbfbfcb7fac9ec8be8f57ac9585
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or SEO abuse tactic. One of the primary URLs extracted is https://pelibifir.ru/award?keyword=bloodborne+pathogens+osha+pdf, which is likely part of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/award?keyword=bloodborne+pathogens+osha+pdf PDF link annotation
    • http://prizinsta365.site/101059953858kqdg.pdfIn PDF document text
    • http://kindraretterath.com/desert_worms_brick_rigsobzte.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465539/normal_5fe2dbb69bcc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5ffe88cee3294.pdfIn PDF document text
    • https://dasufurejer.weebly.com/uploads/1/3/0/9/130969026/lumulusuwawuwati.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/6610459.pdfIn PDF document text
    • http://netlysy.online/sezogibubibuwtt34i.pdfIn PDF document text
    • http://mosquito.codes/descent_into_avernusnsz5e.pdfIn PDF document text
    • https://turezizudowan.weebly.com/uploads/1/3/1/6/131606253/jasepofarawu-melevi-kogawix.pdfIn PDF document text
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/tamumurujed.pdfIn PDF document text
    • https://nijolonarezop.weebly.com/uploads/1/3/3/9/133999518/4019638.pdfIn PDF document text
    • http://ro-shop.space/maytag_bravos_xl_gas_dryer_reviewssh0v2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e84c4ad-fcbc-422f-aa6b-ae50c9704a3c/how_to_scan_multiple_pages_canon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d7239f-8b3d-4659-b30d-c6cbde4d7f10/67564045550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1225fd1a-fad3-4b63-905d-1aea96cf2016/what_does_toma_una_foto_mean_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463e8fef-b0db-4fa5-a1ee-c63580a5c9f7/rovufonanok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b896b8c8-12c9-436b-978c-cc0fc341c563/3281243708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63836503-28a6-45c3-82bc-bc41a3b92f7f/hitachi_c12fdh_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804f35ca-1428-4ed8-9c4e-6b7c340d7e18/how_to_manifest_a_financial_miracle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d242c3-7a8b-46d8-812e-8df5efde8a5a/bavekemapidowofutujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4467fd4-2e6c-4ede-a6c7-0e8ad1731bf8/best_tattoo_books_2018.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 5492 bytes
SHA-256: ec29360fb475b7a1ab9072bad8b2d19f59c1e0d4b8338d6f11e1033c8f2eb4b2
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 10368 bytes
SHA-256: 287754df941eb826408587c0a8b4d47501d0512bf1e41125aa5242b1975a20e4