Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7155badf33ae4c7…

MALICIOUS

PDF

80.6 KB Created: 2021-01-21 10:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 107a52d90ca27084a34deded110249ab SHA-1: e1a610d957decb8077dd0fb36b4283cb02ecf4aa SHA-256: a7155badf33ae4c7124d57c7213bf9eb4c7dfc01a2b8587121aa4d89afefd562
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, likely serves to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=talking+angela+2+mod+apk+android+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483104/normal_5ffece1b91e16.pdfIn PDF document text
    • https://site-1176450.mozfiles.com/files/1176450/celeste_google_drive.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/fGTnKNd/world_war_z_game_crossplay.pdfIn PDF document text
    • https://site-1168357.mozfiles.com/files/1168357/35649698212.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/5080320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409420/normal_6004e804ee910.pdfIn PDF document text
    • https://site-1178320.mozfiles.com/files/1178320/new_army_uniforms_us.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386079/normal_5fc8741eb8af0.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/axgjjir/word_games_online_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/VuZbtgi/16660381890.pdfIn PDF document text
    • https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/a3c84.pdfIn PDF document text
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/964175.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/gf5RXge/45388993951.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/pasenin.pdfIn PDF document text
    • https://site-1172118.mozfiles.com/files/1172118/xesijerikozevuzixaro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401723/normal_5ff56f2b8616b.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/0Y3Dhhy/96490339640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezibetaw.epizy.com/google_chrome_portable_2018.pdfIn PDF document text
    • http://femasusatatovet.epizy.com/derivational_affixes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 5300 bytes
SHA-256: 022b60ff39b42192d661e524764f9e869a5002a94ab39781156d75d9c2cf4491
font_01_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 10692 bytes
SHA-256: 32797be958cb856ba0ee0c23a2419dfa53e526e0d70a3516a824923949e34e29
font_02_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 16800 bytes
SHA-256: 826f3ab2b74e2cf46dbb939a051528bc7934e703a86323f1d13665fb865a03af

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