Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3705e77fe1c2ca0…

MALICIOUS

PDF

42.9 KB Created: 2020-03-09 00:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2dd6634c6e2181dd7d0267f19442fe25 SHA-1: 4c35794969d48de94afc8909895b86c3f14cbe5f SHA-256: a3705e77fe1c2ca06cec071412c4888d3ee063febde90c1d384f2dc0f212cd5a
94 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is consistent with a link farm or SEO poisoning attack, designed to drive traffic to potentially malicious sites or manipulate search engine rankings. The primary attack pattern involves directing users to a multitude of external URLs.

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://genting-club.lucky1st.com/uploads/1/3/0/7/130738636/130738636.html#subacute+ruminal+acidosis+in+dutch+dairy+herds
    • http://bestework.com/uploads/1/3/0/2/130287886/7461948.pdf
    • http://carolinegadsby.com/uploads/1/3/0/7/130740195/pebukufuji-jurelawenum-zigexuzol-zimumelefada.pdf
    • http://sinbinnetwork.com/uploads/1/3/0/5/130551671/fivulufep_xudozakawibobo.pdf
    • http://www.oceanviewfamilydentistry.com/uploads/1/3/0/6/130621487/fujuraz-tirexikujurura-fixigak.pdf
    • http://www.poisepublishing.com/uploads/1/3/0/7/130776889/3025580.pdf
    • http://mwvrc.org/uploads/1/3/0/6/130639914/aa3a90fbbdfb.pdf
    • http://morganhomesliving.com/uploads/1/3/0/4/130476150/lizofudowu.pdf
    • http://www.strictlyplays.com/uploads/1/3/0/5/130589088/4567640.pdf
    • http://mail.foodforsenses.com/uploads/1/3/0/5/130550930/lerelir-witawafizufov.pdf
    • http://luguimaraes.com/uploads/1/3/0/6/130639561/kepitagegedoko.pdf
    • http://mercedregionalvision.com/uploads/1/3/0/6/130640067/rufejadam-dejimegelasoj-gumub-javalojena.pdf
    • http://numberonepodcast.net/uploads/1/3/0/8/130874299/vuxeki.pdf
    • http://makeguillotinesgreatagain.com/uploads/1/3/0/3/130313108/kazipimiretizane.pdf
    • http://www.dixie-district-outfitters.com/uploads/1/3/0/5/130546290/1158334.pdf
    • http://acreativedesigncompany.com/uploads/1/3/0/2/130274316/foven.pdf
    • http://scenarscot.com/uploads/1/3/0/7/130739978/2f474b85c3f6b0.pdf
    • http://thesmartyogamat.com/uploads/1/3/0/5/130551160/bupemelesumizak.pdf
    • http://anthonyatti.com/uploads/1/3/0/4/130488832/bozubafal-lolezojenaso-loluzix-vufasigijilelo.pdf
    • http://provincecleaning.com/uploads/1/3/1/0/131070566/mutujigixorodi.pdf
    • http://document-unique.pro/uploads/1/3/0/5/130551127/gawexevaxuvo-lisotekiwebek.pdf
    • http://aquaticadvantagellc.com/uploads/1/3/0/6/130620902/4a1407.pdf
    • http://velocityproxies.com/uploads/1/3/0/5/130545885/vufuxovezijexake.pdf
    • http://velocityproxies.com/uploads/1/3/0/5/1305
    • 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_off00007f34.bin
25b5573756cfbcd9360536616683ed7d27c4689d3d3928de6f95806304396edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F34 7832 bytes

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