Malicious PDF — malware analysis report

Static analysis result for SHA-256 a192a6f3358eeccd…

MALICIOUS

PDF

75.6 KB Created: 2021-02-21 14:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bfca71dcd470d23eab3d7f2ecaa54ac2 SHA-1: 2c35a2d77fd2525de5a0c85c5591c5190c8e3fb4 SHA-256: a192a6f3358eeccd58e831a446c8f487c4b8940b33693d110568b3115b1fcc91
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=what+dish+works+with+wally PDF link annotation
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/gagedu_xemigazuzigodo_kupawalaxilupum_lufokigeroder.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/90fb58f.pdfIn PDF document text
    • https://vezinamitin.weebly.com/uploads/1/3/5/9/135984824/fidomowudap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479906/normal_5fd2c66170813.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/53569456591fycnh.pdfIn PDF document text
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/620457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_602eee28ee097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461511/normal_5ffbe66e89cb3.pdfIn PDF document text
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/kipozel-jaxojubo-tepulabimekewa-saderomolexine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5ffe13fb64dd0.pdfIn PDF document text
    • https://gukujevanedin.weebly.com/uploads/1/3/5/3/135344472/tezajufusugen.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/pevarijidasalop/linux_run_android_emulator_from_command_line.pdfIn PDF document text
    • http://pojitak.epizy.com/intro_to_psychology_practice_test_chapter_1.pdfIn PDF document text
    • http://firuneta.rf.gd/pebadudoweb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 4748 bytes
SHA-256: 3dec46e3f49721fb00514cbaf0eb75849c9c7b6e10ec82b2001fd06336e1a051
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 10608 bytes
SHA-256: 0b4304c1793c23d16776f441c108b5bc56c2ef8e9a0fd29bccdf559523ff2a3a
font_02_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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