Malicious PDF — malware analysis report

Static analysis result for SHA-256 e895602eaab4740b…

MALICIOUS

PDF

75.4 KB Created: 2021-01-17 23:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d82ab2ac33a10d75444cde4d5f04b4f0 SHA-1: 7516c53372f929d8f5bf12a76fe0a54725bdc56a SHA-256: e895602eaab4740b5933907f65cce78d62cf07ac5a83757c4b1f2778a411c907
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'informal assessments' and 'executive functioning', likely serving as a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffi.ru/123?utm_term=informal+assessments+executive+functioning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fe74fdb7a3f8.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/67505255487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_5fa7e7278dc69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_5fa5d63ce9723.pdfIn PDF document text
    • https://site-1173660.mozfiles.com/files/1173660/99639000057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f9426f1c18c8.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/lhbnRoW/wageze.pdfIn PDF document text
    • https://site-1173675.mozfiles.com/files/1173675/real_drift_racing_switch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5fcaa574568bd.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/fcVmie3/entry_level_marketing_jobs_hiring_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_600279b3ada58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fa4aafae61aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fbddfd5938df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371267/normal_5ff54da0189d0.pdfIn PDF document text
    • https://site-1176357.mozfiles.com/files/1176357/dedoxom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_5f9f72535e49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5f9f3a3d3efb6.pdfIn PDF document text
    • https://site-1171969.mozfiles.com/files/1171969/pinball_games_for_sale_near_me.pdfIn PDF document text
    • https://site-1173168.mozfiles.com/files/1173168/79911088297.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5268 bytes
SHA-256: 24838b91f17198a7cbf8c10a7586a001ba08e4b4b038e5d68f9f7d34d9f9d71c
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 11204 bytes
SHA-256: 4ca080b50d0ae9bd706cee646c8d7a606c55687baedc2a6597d325486b3a15a8

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