Malicious PDF — malware analysis report

Static analysis result for SHA-256 1242624b7276f141…

MALICIOUS

PDF

44.6 KB Created: 2020-03-19 09:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7231cb54bef262239dc995169dd19dc3 SHA-1: 954f1fe7e5367079fe8d5cf8e5f1bc2c18d0e012 SHA-256: 1242624b7276f141802ee7a050e6d25dcb5177b78d118f00e0305eb75283959d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or engage in phishing. No scripts were extracted, but the sheer volume of external links is the primary indicator of malicious activity.

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.
  • ClamAV: Pdf.Dropper.Agent-9057090-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9057090-0
  • 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://rachellepinnow.com/uploads/1/3/0/5/130551331/130551331.html#ug+feu%2Fml+to+mg%2Fl
    • http://mspokrantsband.ca/uploads/1/3/0/6/130621754/kogarerut.pdf
    • http://karunaforanimals.com/uploads/1/3/0/4/130488539/ecba8a30e86fed.pdf
    • http://rhythmjackson.com/uploads/1/3/0/5/130550891/db0522a037c.pdf
    • http://everythinggoddess.net/uploads/1/3/0/5/130550848/3778314.pdf
    • http://www.topteampainting.com/uploads/1/3/1/0/131070527/tasifurisa.pdf
    • http://artsfiosdemalha.com/uploads/1/3/0/5/130543483/fakuxuzuzuzab-xufapoxawero-latum.pdf
    • http://simscambodia.com/uploads/1/3/0/6/130620391/xojawigemubunorixug.pdf
    • http://capitalfencingmaintenance.com/uploads/1/3/0/5/130588749/7139607.pdf
    • http://sweetsadiesdoggieboutiqueonline.com/uploads/1/3/0/4/130476766/7007842.pdf
    • http://www.hammcrafted.com/uploads/1/3/0/3/130323301/bawiri.pdf
    • http://www.mfwwinecompany.com/uploads/1/3/0/3/130379581/3938869.pdf
    • http://www.calgarymarketingonline.com/uploads/1/3/0/5/130539348/sawazis-boxivemojoxedi.pdf
    • http://williampmorgan.com/uploads/1/3/0/5/130543084/vejupakonibumorib.pdf
    • http://waxplast.com/uploads/1/3/0/8/130813369/nidizozokedibidet.pdf
    • http://x0897259xstreamtravel.xsideas.com/uploads/1/3/0/9/130970004/b82783574b7.pdf
    • http://foreverdiamondsandmoresj.com/uploads/1/3/0/5/130551728/rabukewipabugogivipo.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a3b.bin
36158c3a3cb027bab9f9a3b252be68bc72bc5e41860f5c282653f506cea19bcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3B 8660 bytes
font_01_sfnt_off00009b2b.bin
72ab9c1d45ca061302144ebd98c51933fae6b4c57a007e0fc7dabe8b7a920349
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2B 2768 bytes