Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c68729707a75e99…

MALICIOUS

PDF

31.6 KB Created: 2020-06-05 00:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93a10f7dc3423d6e8d5a0a8e58a25ef0 SHA-1: 2e873bf71e315eee82be3029019e64dcf6cbdc8d SHA-256: 7c68729707a75e99ca944d80e9c847d40755fced7d8c0d56e3a002f292b74941
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are structured as a link farm. The document body, though heavily obfuscated, contains a URL that appears to be a lure for printer instructions. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to redirect users to malicious websites. No scripts were extracted, but the overall structure points to a phishing or content-luring attack.

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://youngjoopark.net/uploads/1/3/1/4/131453592/131453592.html#hp+printer+3630+instructions
    • http://integroep.com/uploads/1/3/0/5/130589309/4635331.pdf
    • http://wojtasekrealty.com/uploads/1/3/0/8/130814157/ed42e.pdf
    • http://breadmedia.watch/uploads/1/3/0/3/130324340/6191327.pdf
    • http://barrajacks.com.au/uploads/1/3/1/8/131856797/3702785.pdf
    • http://mail.team-lead-grow.com/uploads/1/3/1/1/131164549/9b48d9b732943c.pdf
    • http://avalisconsulting.com/uploads/1/3/0/5/130551362/6f9105cda3432.pdf
    • http://marksasphaltpaving.com/uploads/1/3/0/9/130969371/nuguvazimof.pdf
    • http://mta-sts.mail.ourcontainer.com/uploads/1/3/1/8/131871856/f0d822732b7bc.pdf
    • http://adsl-65-71-85-47.lawsnakard.com/uploads/1/3/0/7/130740148/4076284.pdf
    • http://youngjoopark.net/uploads/1/3/1/4/131453592/terms.html
    • http://youngjoopark.net/uploads/1/3/1/4/131453592/dmca.html
    • http://youngjoopark.net/uploads/1/3/1/4/131453592/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://banibejazona.files.wordpress.com/2020/06/xojesoxiguxege.pdf
    • https://zofegix.files.wordpress.com/2020/06/43927833598.pdf
    • https://jomosuwedel.files.wordpress.com/2020/06/32761242717.pdf
    • https://pikerovin.files.wordpress.com/2020/06/58564028758.pdf
    • https://meluvib.files.wordpress.com/2020/06/97680937597.pdf
    • https://wevamuxugivi.files.wordpress.com/2020/06/robozakalu.pdf
    • https://ladisipe.files.wordpress.com/2020/06/92940254550.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005126.bin
9f416c954a5cda57c50eb6e0ab15fa5cb42c1b1415a9e15960fbddc076883a1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5126 9688 bytes