Malicious PDF — malware analysis report

Static analysis result for SHA-256 9921c2b43353f500…

MALICIOUS

PDF

46.4 KB Created: 2020-05-13 09:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fd4d7cd71d36be4872547d1960f80181 SHA-1: 8a29c4af149382ac29abfca6092b26ee4bbd29a5 SHA-256: 9921c2b43353f5002b279589c6cabd30eafed10c87178b2ec3bb5120c83accbd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm designed to host malicious content. One prominent link, http://elaurayoga.net/uploads/1/3/0/8/130874608/130874608.html#taiwan+server+vpn+apk, indicates a lure related to VPNs. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm and the specific lure suggest a phishing or malware distribution attempt.

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://elaurayoga.net/uploads/1/3/0/8/130874608/130874608.html#taiwan+server+vpn+apk
    • http://tristanhudon.com/uploads/1/3/0/4/130476135/totuxupene-xuwidisi.pdf
    • http://wpleague.org/uploads/1/3/0/7/130739332/gafaxomi.pdf
    • http://therealwhiteman.com/uploads/1/3/1/8/131856042/9931478.pdf
    • http://alexsservicesinc.com/uploads/1/3/1/4/131413148/zuxuxu_wodarazavura_kuxujigewo.pdf
    • http://jellybean14.com/uploads/1/3/0/6/130640199/311ba.pdf
    • http://clarksvillehomeinspectionpros.com/uploads/1/3/0/2/130272636/56b38a4b.pdf
    • http://debsearthscapes.com/uploads/1/3/0/3/130379611/3469419.pdf
    • http://normantownchristian.com/uploads/1/3/0/6/130620234/zomiluwekiw.pdf
    • http://tristanhudon.com/uploads/1/3/0/4/130476135/totuxupene-xuwidis
    • 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_off00007400.bin
0224dc2208600d3c892b294a4c8f66f7efec548814545fffe7af43ebbfc4a48d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7400 10780 bytes
font_01_sfnt_off00009945.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9945 16092 bytes

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