Malicious PDF — malware analysis report

Static analysis result for SHA-256 321b60c447677aa3…

MALICIOUS

PDF

52.0 KB Created: 2020-04-15 17:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 354415b100935706c6a25dbd344475ab SHA-1: 1c88e7e073b07f85eb1b43f9ec0efe6c958c9896 SHA-256: 321b60c447677aa33f494b315347171b4a39fdeaaa34c23fbce31fa43341cfdb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary URL, http://easyfreelegal.com/uploads/1/3/0/2/130289675/130289675.html#compelling+information+in+spanish, suggests a lure for users seeking information. The ML classifier strongly indicates maliciousness, likely due to the SEO link farm technique used to distribute malicious content or manipulate search rankings. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://easyfreelegal.com/uploads/1/3/0/2/130289675/130289675.html#compelling+information+in+spanish
    • http://dexann.com/uploads/1/3/0/5/130550855/fuvawox.pdf
    • http://healinghandstrt.com/uploads/1/3/0/6/130605278/mipakemuvudij_jopirosarukaded_safuza_jagun.pdf
    • http://graphflexprint.com/uploads/1/3/0/7/130775921/bupaluwenamesa.pdf
    • http://6290fairviewroad.com/uploads/1/3/0/3/130324112/womujadekizututetaz.pdf
    • http://legacycleaningservices.org/uploads/1/3/0/3/130313194/gezavutal-zixubosuposiv-luzupewize-joxube.pdf
    • http://thehappiestpuppy.com/uploads/1/3/0/6/130621819/ae831e520.pdf
    • http://thebpstation.com/uploads/1/3/0/6/130620881/rifaganuliponupi.pdf
    • http://ocpioneerfootball.com/uploads/1/3/0/9/130969926/833363.pdf
    • http://annarbormothertree.com/uploads/1/3/0/2/130272260/6460309.pdf
    • http://gothamemt.com/uploads/1/3/0/7/130738716/9329368.pdf
    • http://hotmesshighvibes.com/uploads/1/3/1/1/131164479/zuzuto_goberava_poribijuzawal.pdf
    • http://seasideconstructionofcostarica.com/uploads/1/3/0/4/130483847/redixewoxeb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b6d.bin
5547f10c9cf00a4ba1353142dab3150e1718bfcb13b9fae294dc4b7a1919805a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6D 9232 bytes
font_01_sfnt_off0000ad1c.bin
65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1C 16096 bytes

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