Malicious PDF — malware analysis report

Static analysis result for SHA-256 8112a1d75bd1b4da…

MALICIOUS

PDF

67.8 KB Created: 2020-05-19 17:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f08ade30e373f368efefdbf3851b439 SHA-1: d1ddbee157083e5eb3b3dbb72f2b562a130fb49e SHA-256: 8112a1d75bd1b4dae6aad099a04b86f8f90e1b3c5964d4e740f9bbfb18f6088d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or SEO spam tactic, designed to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body text is heavily obfuscated, but the pattern of numerous external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://afaparents.org/uploads/1/3/1/4/131437293/131437293.html#teorias+contemporaneas+del+aprendiza
    • http://otium-emporium.com/uploads/1/3/0/2/130289809/logajaxizafu.pdf
    • http://loftpromotions.com/uploads/1/3/0/5/130540046/zaxena.pdf
    • http://devonhouseandhounds.com/uploads/1/3/0/7/130775505/a17101.pdf
    • http://nutrijohanafitness.com/uploads/1/3/1/4/131453321/penedeposif.pdf
    • http://junkremoveservice.com/uploads/1/3/0/4/130435848/48ed19.pdf
    • http://prg5.com/uploads/1/3/0/3/130324191/1229487.pdf
    • http://tastemakerllc.com/uploads/1/3/0/8/130874239/7499439.pdf
    • http://cprtrainingconcepts.com/uploads/1/3/0/3/130379380/dabenojimagefun.pdf
    • http://groomsbyjagger.com/uploads/1/3/0/5/130540065/fejogisuko_veredadev_seganim_wezatibipenixi.pdf
    • http://mollykidder.com/uploads/1/3/0/4/130476896/2543364f3b9a004.pdf
    • http://dakinegrindzrestaurant.com/uploads/1/3/0/5/130551011/rufamavufofizewe.pdf
    • http://lilboypete.com/uploads/1/3/1/1/131163667/famirojar.pdf
    • http://funsmanager.com/uploads/1/3/1/3/131378990/gibemobomuzewojekiri.pdf
    • http://naturesessences.ca/uploads/1/3/0/6/130621351/xosefaji.pdf
    • http://sunfanglu.com/uploads/1/3/0/7/130776592/nuvesajeruvikol_xetibamopape_nebun.pdf
    • http://eapworksau.com/uploads/1/3/0/6/130639241/34d12f43d2e9a28.pdf
    • http://340viva.org/uploads/1/3/0/6/130621892/2118834.pdf
    • http://bpimienta.net/uploads/1/3/1/3/131383747/borifipavis-fuwaboregi-pufaseba-maxusubuv.pdf
    • http://htwatts.com/uploads/1/3/0/8/130874393/mawapimobikabe.pdf
    • http://eyecarecenterwakeforest.net/uploads/1/3/0/7/130776101/5855612.pdf
    • http://chickinabasket.com/uploads/1/3/0/8/130813413/e9b1be.pdf
    • http://fictionalcharacterology.com/uploads/1/3/0/5/130538859/kaleku_sijasudowonowid_nonuwudove_mufaxiduteko.pdf
    • http://maisonsdelasagessetraduire.org/uploads/1/3/0/2/130274088/vozuzuragi.pdf
    • http://thegoldenreview.com/uploads/1/3/0/5/130547613/efafa8b1d2c65df.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_off0000d9c2.bin
65b7df7bf3e4e54c825a88d1539cd16c05a600185356ba42fc20c1e855cfd263		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 12072 bytes

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