Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b7896cdd7c4890…

MALICIOUS

PDF

31.9 KB Created: 2020-06-04 15:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37ad596b9797d643bd87173f6b130e6a SHA-1: b7606bbb0d42215dd511c2b034f98ed94c84ecd0 SHA-256: b1b7896cdd7c4890f7a1bc4d20dcf1e58833e7153d05b17273192c4d9cc526fa
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body contains a mix of seemingly unrelated text and URLs, suggesting a tactic to generate traffic or distribute further content through a link farm. The primary attack pattern involves directing users to a network of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ajcivilconstruction.com/uploads/1/3/0/6/130621803/130621803.html#real+husbands+of+hollywood+season+3+episode+1
    • http://klutchkickingkings.com/uploads/1/3/1/1/131163725/8193540.pdf
    • http://amyobrienfortownclerk.com/uploads/1/3/0/2/130289241/8010842.pdf
    • http://nextcap.us/uploads/1/3/0/6/130639729/6897836.pdf
    • http://cozyoasis.com/uploads/1/3/1/6/131637603/726f17424f.pdf
    • http://kinkshairwinchmorehill.com/uploads/1/3/1/6/131637247/nifutatez.pdf
    • http://susantower.com/uploads/1/3/1/4/131438523/ladasozere_bibikofofom_wagovapifugeb_newaro.pdf
    • http://gethandsomejacks.com/uploads/1/3/1/4/131438249/5f42ef833da.pdf
    • http://kahlonjicosmetics.com/uploads/1/3/1/0/131070872/fakere-lusami.pdf
    • http://gbxevents.co.uk/uploads/1/3/0/3/130324241/gevuwutala.pdf
    • http://ajcivilconstruction.com/uploads/1/3/0/6/130621803/terms.html
    • http://ajcivilconstruction.com/uploads/1/3/0/6/130621803/dmca.html
    • http://ajcivilconstruction.com/uploads/1/3/0/6/130621803/policy.html
    • https://koxowite.files.wordpress.com/2020/06/77119885630.pdf
    • https://fibizetu452198143.files.wordpress.com/2020/06/11039260823.pdf
    • https://komotugi.files.wordpress.com/2020/06/3685184163.pdf
    • https://kakenobejoz.files.wordpress.com/2020/06/51045603207.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_off000051fe.bin
a00f3fdcb60b7a83fa4925ac0da2cd6072781f26a7b17d228070332499a34ebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51FE 10192 bytes

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