Malicious PDF — malware analysis report

Static analysis result for SHA-256 725c881f4f2b9526…

MALICIOUS

PDF

35.9 KB Created: 2020-05-24 11:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65b6b58c96a3fda1015ef93286b89c47 SHA-1: 0eb4765652a20d3b43bd12d607bd2918fa84ebcb SHA-256: 725c881f4f2b952614170880cb1416fbcf2a79bd8e35c929559896dd71873998
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This suggests a link farm or SEO poisoning tactic to distribute malicious content or traffic. The ML classifier strongly indicated maliciousness, and the PDF structure is consistent with attempts to obscure the true nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://74-123-75-235.mgwnet.com/uploads/1/3/0/6/130639124/130639124.html#%25C3%25B6ktem+ba%25C5%259Fol+senaryo+kitab%25C4%25B1
    • http://jjartmedia.com/uploads/1/3/0/7/130738704/nekidev_wilon_mafas.pdf
    • http://skyhighfittedclothing.com/uploads/1/3/1/8/131871571/220ca2ca2d380.pdf
    • http://mountainviewconcreteco.com/uploads/1/3/1/8/131856547/befazutuniwu_fozaxi.pdf
    • http://determineddigital.net/uploads/1/3/0/5/130551750/kutexaxinutuwam_zosetotutuveki_vorazuzo_joletobori.pdf
    • http://lordgrant.com/uploads/1/3/1/0/131071289/2b5b423eb.pdf
    • http://jacobsentape.com/uploads/1/3/2/3/132302942/tozokilaguteju.pdf
    • http://webmail.discusamerica.com/uploads/1/3/1/6/131607005/7200615.pdf
    • http://zogems.com/uploads/1/3/2/3/132302833/pagobofesuzamowigili.pdf
    • http://newmexicofashioninfo.com/uploads/1/3/0/5/130550858/f557527402fc3.pdf
    • http://lasquetiliving.com/uploads/1/3/1/4/131408280/1636342.pdf
    • http://originszoological.org/uploads/1/3/1/4/131438337/1620012.pdf
    • http://mysticalearthadventures.com/uploads/1/3/0/8/130813782/53ae38.pdf
    • http://plussizeweddingdressrhodeisland.com/uploads/1/3/0/6/130604958/ginuz.pdf
    • http://nintenbuzz.com/uploads/1/3/1/4/131483343/0a9af0a5.pdf
    • http://gogizzmos.com/uploads/1/3/0/9/130968962/9793494.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005817.bin
c298caad6e94c569a3ab33f11853a68eb513b9300e2dbf07b9f0c9db2ba4edbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5817 13828 bytes

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