Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb6c3d55d4cfbb4…

MALICIOUS

PDF

92.6 KB Created: 2021-04-01 05:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc23fc152035246032d5258d0083a32a SHA-1: 2d2406869840139e0f7f3c5d29438af09c8b2019 SHA-256: 6bb6c3d55d4cfbb4315fc7313e7a1c45c486ac0ae4b1fc991ad81bb40084be62
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to various websites. One of the primary URLs observed is https://ponafet.ru/wix?keyword=homo+faber+pdf+po+polsku. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=homo+faber+pdf+po+polsku
    • https://dulebolipema.weebly.com/uploads/1/3/5/9/135997598/wopal.pdf
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/1811996.pdf
    • https://livupojinobiz.weebly.com/uploads/1/3/1/8/131856358/c708371c.pdf
    • https://mifopubulu.weebly.com/uploads/1/3/1/6/131637027/8e844c0.pdf
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/2c10d06.pdf
    • https://cdn.sqhk.co/filodomazora/e7mU41J/34272900118.pdf
    • https://misirukizos.weebly.com/uploads/1/3/4/0/134017349/zabukonojum.pdf
    • https://netukilegulises.weebly.com/uploads/1/3/1/6/131606016/jutijukadig-liwoginesufebe.pdf
    • https://cdn.sqhk.co/woravejafeto/phhUOKP/93936411502.pdf
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/4ea6c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1629d056-0f14-4acf-b7ae-8bd39ba977fd/black_and_decker_18v_battery_charger_not_working.pdf
    • https://uploads.strikinglycdn.com/files/e0e95330-a617-4edc-9982-2c59680fd93e/ca_residential_rental_agreement_form_410.pdf
    • https://uploads.strikinglycdn.com/files/ebc02031-f370-49b0-95e5-6cdadd47c760/gusudajibuzefonawowuje.pdf
    • https://uploads.strikinglycdn.com/files/8960e02b-7d21-45ff-9680-24d4311f9875/fegewomeduwezuxonobi.pdf
    • https://s3.amazonaws.com/suxugipipolazog/12918545221.pdf
    • https://s3.amazonaws.com/zurovajij/vatodutimuradesubojasegu.pdf
    • https://uploads.strikinglycdn.com/files/09eaca1e-b0c7-4d15-a6fa-ed845acffe20/8104719793.pdf
    • https://s3.amazonaws.com/geraromu/7703703273.pdf
    • https://uploads.strikinglycdn.com/files/d9ff8d05-60fe-4028-9526-fa545bb0a6df/93723588291.pdf
    • https://s3.amazonaws.com/mogipegi/53506249.pdf
    • https://uploads.strikinglycdn.com/files/add04e37-4c0c-42a3-8ff6-3f94c003b3f0/char_broil_performance_grill_wont_ignite.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001283e.bin
c2d1b063634af7924455cce76fd58f19ff041ccce256d7245fe25a6479e7de1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 5352 bytes
font_01_sfnt_off00013a51.bin
9ef5a7b4e3896a675985181d093df1c67e2eb965c4cd80e6b73d8c4c4676bf04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 13780 bytes

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