Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc900eaa7b136a06…

MALICIOUS

PDF

34.7 KB Created: 2020-05-21 23:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 396e49b394fb83dc78c09715adeb629c SHA-1: e1676127c9db17e4e48186c243c829860dbaa0b3 SHA-256: cc900eaa7b136a068479dab7bb88e84b58d9646ad49509770ef8da5fbb7b733a
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to direct users to malicious websites. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the PDF structure and numerous URLs suggest a delivery mechanism for further malicious content or phishing attempts.

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://actforwardengraving.com/uploads/1/3/0/8/130874477/130874477.html#canon+printer+mg4250+manual
    • http://michellecortese.com/uploads/1/3/1/4/131438477/8687373.pdf
    • http://shearwaterwarmbloods.ca/uploads/1/3/1/6/131606677/d7d36960.pdf
    • http://activefrenchbuldogspups.org/uploads/1/3/0/5/130544243/ec46ab0069a.pdf
    • http://directcarenepal.org/uploads/1/3/0/2/130288630/56d7fadaf7.pdf
    • http://poketanque.com/uploads/1/3/0/5/130588246/6271997.pdf
    • http://englephysics.com/uploads/1/3/1/6/131606583/c7be89.pdf
    • http://crossfitbluepride.org/uploads/1/3/1/6/131606594/tusiwomafavezir_pabavagu_bibeg_gakan.pdf
    • http://helmrealtygroup.com/uploads/1/3/0/3/130313089/6197060.pdf
    • http://rctaxconsulting.net/uploads/1/3/0/5/130545429/zesagetijaf.pdf
    • http://maryannwall.net/uploads/1/3/1/3/131398288/sodakokumasiso.pdf
    • http://thefourmonthnightmare.com/uploads/1/3/0/7/130740056/5312522.pdf
    • http://ctlevent.com/uploads/1/3/0/7/130776644/6334652.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_off00005cfd.bin
0178639e39c060cadd1d74f3c68bebe8cc691f1dc8097f30cf62d4f6d257fba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFD 10232 bytes

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