Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba3608676413253…

MALICIOUS

PDF

41.7 KB Created: 2020-04-07 06:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5a6300dba6ac5898815ffbc4e143d897 SHA-1: 0fa8589940345c11ac7e01cf954a762e5dcea66f SHA-256: 0ba3608676413253c101f6e7340955e601e37ab1db03ed958043ec4cd028d845
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute further payloads or lead users to malicious sites. The embedded URLs are the primary indicators of compromise.

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.
  • ClamAV: Pdf.Dropper.Agent-8197455-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8197455-0
  • 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://yourbodydrip.com/uploads/1/3/0/8/130813896/130813896.html#how+to+make+a+triple+rubber+band+bracelet+without+loom
    • http://nowtrainer.com/uploads/1/3/0/6/130605094/b7d5a6c4652e7f.pdf
    • http://ebanindy.com/uploads/1/3/0/5/130546290/davesoku.pdf
    • http://leahphillipsmusic.com/uploads/1/3/0/3/130323967/372dfe22.pdf
    • http://dhmmentalhealthcare.org/uploads/1/3/0/5/130539414/e3ae7a36575a.pdf
    • http://gotomylease.com/uploads/1/3/1/4/131438788/vojerixif-budetop-welomaleposuf.pdf
    • http://dannymendick.com/uploads/1/3/0/3/130379627/d4e138de9a.pdf
    • http://hueysessentials.com/uploads/1/3/0/8/130874254/sodinirugejeko_kosogebere_mitimilalazo_tubunovoxa.pdf
    • http://www.anathema-thefilm.com/uploads/1/3/0/5/130588319/9511090.pdf
    • http://www.ongaroconcretedesign.com/uploads/1/3/1/4/131437685/d1aadc469ca957.pdf
    • http://avonmorehotelandmotel.com/uploads/1/3/0/7/130738924/gasoxekemureg.pdf
    • http://knotandgrains.com/uploads/1/3/0/2/130273624/fadf6.pdf
    • http://thedogmom.net/uploads/1/3/0/5/130588803/vuseramami.pdf
    • http://elenyacht.net/uploads/1/3/0/4/130489475/74206b4a9372d4.pdf
    • http://mindfulmansi.com/uploads/1/3/0/6/130620565/af3afc9d20.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_off00007941.bin
33b0f631b0bdf457f09ad2e5773f1fe23817a83d51e0a6500ec6f560852b23db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7941 8348 bytes

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