Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f4337e873668fc…

MALICIOUS

PDF

75.4 KB Created: 2021-03-22 01:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 71d14f5a927d1e39d3063bb6f7650b5c SHA-1: 39d54828281cf3c5f758b339665148217fd5536b SHA-256: 80f4337e873668fc2fd5f54ab92f1784c60fe96585cd8ecb06e3076b70d866c6
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to its creation, and the presence of external links indicates a likely phishing or SEO spam attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://vilenefex.ru/wix?keyword=american+journey+textbook+glossary PDF link annotation
    • https://cdn.sqhk.co/denirinodo/jiRNXia/electric_guitar_power_chords_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/eicBc7O/bulivofugoruvukipogul.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/fraction_number_line_worksheets_grade_69o8e9.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/5a0b4b52c79250e.pdfIn PDF document text
    • http://ita-bio.space/xeninefup4jir.pdfIn PDF document text
    • https://paxiguvemogi.weebly.com/uploads/1/3/4/3/134317910/9654460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_603c37d02be7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_600ce2de49873.pdfIn PDF document text
    • http://max-lifting.store/wuritedoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_60268d5b63521.pdfIn PDF document text
    • http://tronreserve.online/zulorigedukodofafidopijudm5qb.pdfIn PDF document text
    • https://bakusiluvusefe.weebly.com/uploads/1/3/5/3/135309983/1384064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464539/normal_5fe33f7f8032c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/vavilu.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_83a89a94fafd4a85bd80a67a4f283465.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_d9bf97de6a924dddad05d1252da81065.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/osrs_rune_pure_quest_guide.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_7d5c5a602fed407596f8c4b49d101b38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/bypass_icloud_activation_lock_iphone_6.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_a6c54f003427452c9f247f0330e46d2e.pdf?index=trueIn PDF document text
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_887ca649e6064c998499cbfe04053dea.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 5440 bytes
SHA-256: e158649ee18ccf8b989464683b7789d3c710e2705a19d0c8da53ee17febb027f
font_01_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 10444 bytes
SHA-256: 58ee4d518ede1a0e81925222a6d75189f26aedb08902e6f8af107eff281c38a1
font_02_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378