Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e14c776436d535…

MALICIOUS

PDF

43.6 KB Created: 2020-04-02 13:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 154734ad276cb1bff2ec10226b229d62 SHA-1: 849b7e3d13c9ce4e653fe2a4c152dd66e508ba0d SHA-256: d7e14c776436d535288653b64a15dc6ca129608b37dd895c40adfd5e0f219fc2
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to numeric or slug-based URLs on various domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine ranking for undesirable sites. The ML classifier strongly supports the malicious nature of this PDF.

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://dreampicspixelart.com/uploads/1/3/0/2/130289429/130289429.html#reglas+ortograficas+byv
    • http://butcanyoudecide.net/uploads/1/3/0/6/130621928/2002092.pdf
    • http://goodbyesonline.com/uploads/1/3/0/5/130543476/452032.pdf
    • http://lakeforrest.org/uploads/1/3/0/8/130873906/678494825c127b.pdf
    • http://www.pwcatl.org/uploads/1/3/0/6/130640006/ae9bef169bc60c.pdf
    • http://haleylarsonarts.com/uploads/1/3/0/4/130436402/ea6a33231a5b7.pdf
    • http://agirlfromodisha.com/uploads/1/3/0/7/130775138/b60a94f3a5c35.pdf
    • http://usafagapc.org/uploads/1/3/0/6/130621051/foxol_sabomugivor_xofejirofij_mevarimopaf.pdf
    • http://nerdherdsocial.com/uploads/1/3/0/6/130620456/jikokoro-rajezarivobak-powolixikox-fasolasazene.pdf
    • http://rockingvskirtsandtees.com/uploads/1/3/0/6/130604361/6703571.pdf
    • http://starharthern.art/uploads/1/3/0/7/130776212/kobeven_gamosozajasaju_zadorimata_fafebividi.pdf
    • http://innov8-today.com/uploads/1/3/0/4/130488152/6287bcc90be6eb7.pdf
    • http://maxstapley.com/uploads/1/3/0/7/130739431/sopilevofu-rivufunu.pdf
    • http://found-and-lost.com/uploads/1/3/0/6/130640044/541b2c213dc0.pdf
    • http://princess-crochet-boutique.com/uploads/1/3/0/2/130288406/vawemikarop.pdf
    • http://dominionlifeministries.org/uploads/1/3/1/4/131453823/sufodelo-zezojosesimef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c58.bin
10662a9c7291f1c52d4ab9d4812a9cc7c0873b4d5fb3f4a31830e1f5c6f29e30
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C58 8744 bytes
font_01_sfnt_off00008c41.bin
65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C41 16096 bytes