Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ea8af892024ebf…

MALICIOUS

PDF

69.0 KB Created: 2021-02-25 12:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a5c36a781834ec5c3ecb81e37cd325af SHA-1: 620011494c2533c1f3d4dfadf95d22202f9197d9 SHA-256: 94ea8af892024ebfb5396961795b907f7eff8bced9d38b698afdba8931d4b9f2
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=shsat+handbook+2019 PDF link annotation
    • http://pafunote.iblogger.org/church_of_christ_twi_songs.pdfIn PDF document text
    • http://topijakalez.22web.org/custodial_worker_1_test_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457320/normal_5fe1b73b2e333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_601f24a655640.pdfIn PDF document text
    • https://puwowuxavuz.weebly.com/uploads/1/3/2/6/132682233/kegotoferegupog-xabisufifom-famajiju-pajufamifixugi.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jcxqhdE/black_hole_io_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366989/normal_5ff579bf1b347.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/1dcabd52.pdfIn PDF document text
    • http://vafakewa.iblogger.org/33408478210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412890/normal_5ff2bda8e9339.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/6ZifD49/87526288372.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/WAwgf2U/nororoleruzotor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_6023907dcdc30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatejufeg.rf.gd/gizozuravepadunizabizu.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/ginorusewawipazemizis.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/data_analysis_using_microsoft_excel.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_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 5576 bytes
SHA-256: c54547a1006d2a6fdef2eaed0fbc19a64c930f7e236b33b15894b8d619d0ce01
font_01_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 10044 bytes
SHA-256: 9625e07987022e5503bc6e96d46e76af88395f333842ea2c823d5825a91ab9cd

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