Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3a9868bd2231b0…

MALICIOUS

PDF

110.7 KB Created: 2021-05-04 12:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eed7cf6da1163b58756d413af058392d SHA-1: b4b7faba3a57676734d107e7cb26de6c3a26f5e5 SHA-256: ea3a9868bd2231b01b283b32d39f024b666d959fcf34f4ce27bacb689c44756a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://baarspo.ru/strik, which is likely used to deliver a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baarspo.ru/strik?utm_term=is+go+ask+alice+based+on+a+true+story PDF link annotation
    • https://cdn.sqhk.co/dirotiweze/iahfija/88963556169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_6052715b7f56a.pdfIn PDF document text
    • http://teragoronowaki.iblogger.org/telecharger_bordereau_de_paiement_cnss_et_amo.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/njgeoxy/dixemab.pdfIn PDF document text
    • http://fegalaro.iblogger.org/aha_af_guidelines_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_6019add025a21.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/hiiQicY/nujasobupebodaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_60220e5e80826.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/KpMa5ii/how_to_make_knife_in_little_alchemy.pdfIn PDF document text
    • https://cdn.sqhk.co/livejizilul/TgfMwhj/6970448393.pdfIn PDF document text
    • http://daselefufirapim.iblogger.org/principles_of_genetics_by_gardner_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390069/normal_600404c89ac3a.pdfIn PDF document text
    • http://goniluze.22web.org/zadekutapizufezub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemibus.epizy.com/example_of_fairy_tales_short_story_with_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef43873-f52a-44aa-a1f1-dabe3ee2d463/61251369706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31070e6-4dcd-46e4-8308-2e6eaf5e0eef/12022027021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/becb0117-73c7-4ae0-a342-327cf8d02377/mosebizapegoledep.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_8c7780b2ae9b4561bf9837757f87490b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c76bcb4-5901-458d-8ae7-aa4b91ae68e8/mumoridosudedamalepagugul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0057b51-7fcb-48eb-9339-c1462c9cbac0/wimimetuwoko.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_8861993d86f849f3924f0ea8ef07fa17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6b7a4a-337e-4b5d-99c2-320e071758f7/pronoun_practice_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8163542a-7993-469a-8f63-9adb88e8fd00/fokumijekugopumipox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ce2b95-418d-4a28-b74f-ba9fe955679b/83610942343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdeab8d-70cd-4a54-bc23-48e729d55b0a/mi_planta_de_naranja_lima_en_espanol.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_86248911e06e451eb462cb61f797dc8e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba54616f-558d-4e52-8e3f-9b71d0118e77/netgear_router_extender_ex3700_setup.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_off0001746b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1746B 5352 bytes
SHA-256: 5acdc6223c40ebafb179f2658a44d7f258a1fb2eda32934f4cde11f1c6f37068
font_01_sfnt_off000186b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B6 11188 bytes
SHA-256: 7b38dd8fcb1abc8a3e2428b128fb19e826a83fe569cdb8d43d31ccd82abf1c39

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