Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c0f949d5b8ac32…

MALICIOUS

PDF

38.3 KB Created: 2020-06-16 20:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c058ede8814bd528500a2b9ab75afe SHA-1: 28730391ca4c248e1d11c72cb51e0095eed8c4be SHA-256: 42c0f949d5b8ac32de8cec76844f219d568917e433d4bcd4136208c96b81f722
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The document body, though obfuscated, contains the title "The mushroom hunter's field guide" and references to wkhtmltopdf, indicating it's a lure. The primary attack pattern involves leveraging these numerous external links, likely to distribute further malicious content or for SEO poisoning. No scripts were extracted from this sample.

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://nyhavnsbodega.dk/uploads/1/3/0/6/130605421/130605421.html#the+mushroom+hunter%2527s+field+guide
    • http://webmail.williamskherkher.com/uploads/1/3/0/3/130379407/3bc1e00659.pdf
    • http://framework.engineering/uploads/1/3/0/7/130739711/4658538.pdf
    • http://passionwithpurposepsu.org/uploads/1/3/1/3/131383775/gowafitikodile-vesal.pdf
    • http://hostmaster.crescentsigncraft.co.uk/uploads/1/3/2/3/132303133/texemito.pdf
    • http://webmail.englishforprofessionals.biz/uploads/1/3/1/4/131437689/resazosaf.pdf
    • http://hydrolactic.com/uploads/1/3/0/9/130969310/8765757.pdf
    • http://mail.a1fitnessusa.com/uploads/1/3/0/8/130873890/zofagexewosaluwo.pdf
    • http://hostmaster.winefest.ca/uploads/1/3/0/5/130551399/fbd95cf6a93d3a8.pdf
    • http://promoproductsmn.com/uploads/1/3/1/8/131856034/gupexovigef_wawutotowiwofu_domut_libejejoxaname.pdf
    • http://picheandcompany.ca/uploads/1/3/0/6/130604067/6070d1d25.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_off00005a55.bin
2cc7385f7a3882593efa1998f213a9132defa1584c9a62757c4737115d64c74c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A55 4976 bytes
font_01_sfnt_off00006b21.bin
c006c2a553f6af7d52ecbc7ba98cf24953db898aebc56708174e200b3d40965a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B21 9960 bytes

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