Malicious PDF — malware analysis report

Static analysis result for SHA-256 670f0f5a9da083f2…

MALICIOUS

PDF

39.0 KB Created: 2020-04-01 11:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a1720bac8610f4e70c72f2c22e89e4b SHA-1: c568d4bfc956a241875ed9b841aa9ea9f2bbac78 SHA-256: 670f0f5a9da083f23066e87601870d7d44b8d604bdc27e9360f87cb80cc0e37a
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are algorithmically generated and point to other PDF files, indicating a link farm or SEO spamming technique. The document body, though partially corrupted, contains a reference to a 'Whisker city small pet fountain filter' and mentions the authoring application, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment.

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.
  • 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://stopeurocide.com/uploads/1/3/0/3/130324030/130324030.html#whisker+city+small+pet+fountain+filter
    • http://trainingcourses.eu/uploads/1/3/0/3/130323510/gajonu_sowamolu.pdf
    • http://headtohair.com/uploads/1/3/0/6/130605493/5675402.pdf
    • http://thepetersfieldbookshop.com/uploads/1/3/0/7/130776423/gezubarag-nepugox-mikiranuged.pdf
    • http://bayouwoodcrafter.com/uploads/1/3/1/4/131406284/9388218.pdf
    • http://rebontheweb.com/uploads/1/3/0/4/130435781/nabanutim.pdf
    • http://golazboy.com/uploads/1/3/0/5/130551745/3451862.pdf
    • http://surgis.net/uploads/1/3/1/4/131408024/d60d30bd6e.pdf
    • http://lydiahershauer.com/uploads/1/3/0/5/130539165/70b5c6ea5aa.pdf
    • http://cvkelectric.com/uploads/1/3/1/3/131379380/xozitagevaranularil.pdf
    • http://americanapostolicoldcatholicchurch.com/uploads/1/3/0/9/130969080/deboxemom-xepatatobobete-xefiro-jogamopel.pdf
    • http://luisangelvelizexitproject.com/uploads/1/3/0/6/130639753/mogiradobeto.pdf
    • http://pokeylizardcreations.ca/uploads/1/3/0/8/130874623/fuwikorefubesume.pdf
    • http://sbcsjn.com/uploads/1/3/0/4/130476203/zinivegor_gudojeru.pdf
    • http://hustlewithemma.com/uploads/1/3/0/6/130639107/c96268b81.pdf
    • http://tbc.group/uploads/1/3/0/5/130539457/9696299de.pdf
    • http://interface-agency.com/uploads/1/3/0/6/130605118/fozowuzazab_nesig.pdf
    • http://scrimmies.com/uploads/1/3/0/5/130590717/3262697.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_off0000630a.bin
1d8665380574fa90c7483b5da0f90df33244289afdfd3d49bf18e6d9f4ca1bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630A 8340 bytes
font_01_sfnt_off00008362.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8362 2616 bytes

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