Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac984355e5c7c2b…

MALICIOUS

PDF

39.6 KB Created: 2020-03-29 21:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f560f2e7c01b0bc4bf4ee5a776b55b63 SHA-1: 77057ee7eea5eb67bdcec43c63ddff398b06b3a8 SHA-256: fac984355e5c7c2b51d61d41ba66d3022b1ac9e3931eb6b12f80f0305847cd74
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The document body contains a mix of technical terms and URLs, reinforcing the idea that the primary function is to redirect users to external content.

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://nationalriskmanagementgroup.com/uploads/1/3/0/6/130640092/130640092.html#esquema+replicacion+transcripcion+y+traduccion+del+adn
    • http://demothewriter.com/uploads/1/3/0/5/130588376/rosomejonulovub.pdf
    • http://aleluya.de/uploads/1/3/1/1/131164574/veguvivijudufisoba.pdf
    • http://redrockparentportal.com/uploads/1/3/0/4/130476143/lapimivisa_pinix_bobojida.pdf
    • http://honeyloverfriend.com/uploads/1/3/0/5/130589460/kukulesaga.pdf
    • http://www.liteclear12flagstaff.com/uploads/1/3/0/8/130873996/e29a7.pdf
    • http://ottiservicesllc.net/uploads/1/3/0/2/130289466/nosibelazidug-puwabatowova-siridukod.pdf
    • http://rail66.org/uploads/1/3/0/9/130969294/lodolaxigowinogeter.pdf
    • http://pmelectricalservices.com/uploads/1/3/0/7/130739143/zeporurefelodifoz.pdf
    • http://sixty90baseball.com/uploads/1/3/0/7/130739052/sizodesenusimi.pdf
    • http://vanoorspronkadvies.nl/uploads/1/3/0/8/130874307/mawakewakubukonavig.pdf
    • http://emergencymowertechnicians.com/uploads/1/3/1/3/131380767/mopevofipajowax.pdf
    • http://ns1.ilcpr.com/uploads/1/3/1/3/131379749/rizol.pdf
    • http://lisaben.org/uploads/1/3/0/5/130547069/kixufo-foxerupajige-sesegiwige.pdf
    • http://random-pieces.shop/uploads/1/3/0/2/130287914/6290913.pdf
    • http://dcpanthersfootball.com/uploads/1/3/0/7/130738911/gaxivupi.pdf
    • http://barryoregan.com/uploads/1/3/0/5/130543462/3308499.pdf
    • http://lbibars.com/uploads/1/3/0/9/130969455/fejafov.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_off0000711f.bin
cf327375154aba77a004abb68f02f5d572927469adfe873130bcc91884346136
pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 8192 bytes