Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ea4df2a19676f9…

MALICIOUS

PDF

33.9 KB Created: 2020-05-30 01:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31d954906a4ae7072c24182aec2c4b2d SHA-1: c999548bd45b5892c01a0309e4bf8eb7822e5000 SHA-256: a2ea4df2a19676f9f703e03548e8fb2d6f9d2d436b5bcc545d3375ca3343d7cf
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the mass of external URLs pointing to potentially harmful content.

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://marshallsheatingcoolingllc.com/uploads/1/3/0/2/130287886/130287886.html#sumas+sin+llevar+de+cuatro+cifras
    • http://dailyherbs.eu/uploads/1/3/0/5/130539016/pijanove.pdf
    • http://weheartaudios.com/uploads/1/3/0/5/130588727/89e6b.pdf
    • http://aau-atlanticcoastwrestling.com/uploads/1/3/0/7/130740625/nabiwovemewozazaxiko.pdf
    • http://ludsonline.com/uploads/1/3/1/6/131606598/6870977.pdf
    • http://bigblackcooks.com/uploads/1/3/1/0/131070198/kegefekabeji_vumolinaxox_redeximilet.pdf
    • http://interventionswithasmile.com/uploads/1/3/0/3/130379347/tamapuwufusekumesig.pdf
    • http://plussizebridaldressesma.com/uploads/1/3/1/3/131398475/rizewotetitoxifimaki.pdf
    • http://outstandingfutures.com/uploads/1/3/0/2/130289308/jojuvivof_vivasu.pdf
    • http://jcresidentialcda.com/uploads/1/3/0/2/130287866/ledasufuvet_luzowinunumatiw_senuse_nisabevobu.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_off00005812.bin
e56b32321c5e1bc41d014ff90cf3f71ee90932dec4eb541dc2be47526a609163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5812 11208 bytes

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