Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6db181e5f60b2a…

MALICIOUS

PDF

76.4 KB Created: 2021-04-09 20:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 21c703e5f4c72a681c2d3f47ace13908 SHA-1: 4bbcec961aeda0f49b68c832ed78af0ef62ead12 SHA-256: 2c6db181e5f60b2ab90d3770bd54ddf4921faaa91d77e00fa248c82977fb5dcd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/strik?utm_term=what+is+a+fully+cycled+tank PDF link annotation
    • https://cdn.sqhk.co/bamazaludez/iicZiav/12464174390.pdfIn PDF document text
    • http://techanomic.com/20086150271r1d5z.pdfIn PDF document text
    • http://prizinsta365.online/losing_it_rush_meaningvtiou.pdfIn PDF document text
    • http://itclick.info/how_to_fill_comfort_zone_humidifierasvme.pdfIn PDF document text
    • http://small-italy.space/stock_tanks_for_sale_texas4p910.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/OgfPVUr/mobiruwirakaleboju.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/7SjchaC/largest_asteroid_impact_craters_on_earth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_60bbb9708dd942ca83c33640e0eebedc.pdf?index=trueIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_a88f7e7c54134605b4a6bcfe9e1ce2eb.pdf?index=trueIn PDF document text
    • http://popokexil.rf.gd/how_do_you_reset_a_fujitsu_mini_split.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_95c1e9a1a3b64d69a90d90320a3a027b.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_b4f3603d320f41fcbf50fb5202bfcca0.pdf?index=trueIn PDF document text
    • http://buzuvemujogumob.epizy.com/jafoji.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/juxivanoz.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/nikagin.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_b27137e6bf70477990b1fba5ad8325c8.pdf?index=trueIn PDF document text
    • http://minuwugonobusuw.epizy.com/adjective_degrees_of_comparison_exercises.pdfIn PDF document text
    • http://wurekino.epizy.com/32995432284.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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 5192 bytes
SHA-256: b24570bd17cdcab6418fec94d68a93d9f57833eb847caf28d92c059671baa5f3
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 11228 bytes
SHA-256: 6f6d793603c96bf9cbc51d55fb8d7372ca9880a0fcec68e8a8dd5dc2171ed4e5

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