Malicious PDF — malware analysis report

Static analysis result for SHA-256 605ba6d20f6460e1…

MALICIOUS

PDF

40.6 KB Created: 2020-03-20 13:38:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7e8c8a6496d88e4aecf35fb11238df2 SHA-1: 713d69541c4ce4c10176963f68b95de700e2bc71 SHA-256: 605ba6d20f6460e1f0d738971e28edc04bd38addbf6a46baa75ef42da22cb4c6
136 Risk Score

Malware Insights

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

The PDF document contains a link farm of external URLs, many of which point to other PDF files, suggesting a tactic to distribute malicious content or SEO spam. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to open a password-protected archive, a common method to bypass gateway security. No scripts were extracted, but the presence of numerous external links and the password lure heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://mermaidicamusic.com/uploads/1/3/0/4/130476798/130476798.html#antagonismo+y+sinergismo+entre+nutrientes
    • http://livelifecreations.co.uk/uploads/1/3/0/9/130969265/zekitanugigulufa.pdf
    • http://www.mimbestore.com/uploads/1/3/0/5/130589163/ff508c5e3b4c2.pdf
    • http://www.innervisionwellnessonline.com/uploads/1/3/0/5/130589345/3cbdd944a717b62.pdf
    • http://lateralthinking.me/uploads/1/3/0/4/130436271/vevobulofimaduvu.pdf
    • http://www.mymandatups.com/uploads/1/3/0/7/130775282/remupimewofaxo_ponalapexa_sipovetogukab_nelitu.pdf
    • http://grpastors.com/uploads/1/3/0/7/130740200/5754613.pdf
    • http://thebusstopshere.org/uploads/1/3/0/6/130604703/49181805.pdf
    • http://ekki.co/uploads/1/3/0/3/130313106/sonunawonoxuwokad.pdf
    • http://ubs-taxfree-puertorico.com/uploads/1/3/0/6/130603852/5809804.pdf
    • http://cpanel.tarawattdesign.com/uploads/1/3/0/9/130969158/5603380.pdf
    • http://shelfstalker.net/uploads/1/3/0/5/130590481/d26cc2879.pdf
    • http://juandou.net/uploads/1/3/0/6/130621531/sazavimo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074fe.bin
a5aae9ce2b958a20e01fbf557003da464e607b446e7f0a41bd776662ef694de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FE 8500 bytes

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