Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd703c3a757d91a…

MALICIOUS

PDF

41.4 KB Created: 2020-03-23 10:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dd0f430c182f0587e3e1678d8cee3346 SHA-1: 5c80871f2e58db63427bbe92ffd985183bc0c7a6 SHA-256: cfd703c3a757d91a04981c96718604b77b6e9d55f8c9986fb23812c599520a2d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document was flagged by an ML classifier as malicious. Static analysis revealed a large number of external links, indicating a link farm designed to distribute malicious content or conduct phishing. The primary heuristic identified a PDF_SEO_LINK_FARM, suggesting the document's purpose is to host numerous outbound links, likely to compromised or attacker-controlled sites. No scripts were extracted, and the document body contained mostly metadata and garbled text, reinforcing the focus on the link farm as the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://afitoapp.com/uploads/1/3/1/0/131069832/131069832.html#composicion+quimica+agua+mineral
    • http://nomoremessingaround.com/uploads/1/3/0/4/130488199/fomapunopevolare.pdf
    • http://www.manereligion.com/uploads/1/3/0/5/130550672/nokajela.pdf
    • http://www.adult.kameronmessmer.com/uploads/1/3/0/5/130589094/10c13617587.pdf
    • http://pitmeddenmusic.org/uploads/1/3/0/2/130288932/5136024.pdf
    • http://beatwood.eu/uploads/1/3/0/4/130477613/dofawegoxix-wowetabipavibup.pdf
    • http://queensontherun.com/uploads/1/3/0/5/130550703/8f6fb59415aac.pdf
    • http://solecobbler.com/uploads/1/3/0/5/130590278/faniworijevo.pdf
    • http://nyc-update.com/uploads/1/3/0/8/130813669/tabivazi.pdf
    • http://intuitivesuccesscenter.com/uploads/1/3/0/5/130538923/948468.pdf
    • http://globalimpactfunding.com/uploads/1/3/0/5/130539922/9192008.pdf
    • http://unmysterium.com/uploads/1/3/0/2/130287930/nogonogidomadixeka.pdf
    • http://www.betsyandtodd.com/uploads/1/3/0/5/130544468/jirewulojidesas-xisope.pdf
    • http://holypostdigital.org/uploads/1/3/0/6/130604465/remunonuxuvomevokum.pdf
    • http://exclusiverei.com/uploads/1/3/0/7/130775520/c1a3940d.pdf
    • http://mustlikeplants.com/uploads/1/3/0/6/130621206/nedixotetogan.pdf
    • http://tiffanyfoster.ca/uploads/1/3/0/2/130272977/9013888.pdf
    • http://lgbtpsychotherapy.org/uploads/1/3/0/5/130539243/wafixakiloga-kutexumofexejo-jejaxetifij-dibevatenobatuj.pdf
    • http://miamibeachboatclean.com/uploads/1/3/0/3/130323172/2041266.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_off0000760e.bin
42ca393b41e06ea9de47336661baf0360491809c30873cf42145b6154b1ec458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760E 8988 bytes

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