Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b17e4732d65dcc…

MALICIOUS

PDF

35.6 KB Created: 2020-05-21 13:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 924a3a2928750a118467a841b241f412 SHA-1: 9123f558e36a6c67bb8f6c48b7fb247f36b58005 SHA-256: 28b17e4732d65dccd41619a52c3e6d220b2b185cd946d7dedca9de29b7e8e710
144 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell T1059.003 Windows Command Shell

The PDF file contains a large number of external links to other PDF files, indicative of a link farm or redirection scheme. It also contains instructions to disable security software, a common tactic to bypass defenses. The embedded URLs suggest a pattern of hosting malicious content on compromised or disposable domains. No scripts were extracted, limiting the analysis of direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cossam.net/uploads/1/3/0/6/130605273/130605273.html#bad+or+missing+configuration+smite PDF link annotation
    • http://scottoneilmusic.com/uploads/1/3/1/4/131438274/gilujiw_jisuwedudoget_xezavafovogip_jujuniw.pdfIn PDF document text
    • http://flcboutique.shop/uploads/1/3/1/4/131453433/947139.pdfIn PDF document text
    • http://avididonline.com/uploads/1/3/0/5/130588153/wurodomi.pdfIn PDF document text
    • http://clearisacolor.com/uploads/1/3/0/2/130291640/mebirut.pdfIn PDF document text
    • http://swimintuit.com/uploads/1/3/0/6/130603836/4744543.pdfIn PDF document text
    • http://superiorfloorsolutionsllc.com/uploads/1/3/1/4/131483772/lafupamavurowijewava.pdfIn PDF document text
    • http://northwestbookkeepingllc.com/uploads/1/3/1/6/131606395/sivixizi.pdfIn PDF document text
    • http://cdcommercialservicesllc.com/uploads/1/3/1/3/131379193/wafam.pdfIn PDF document text
    • http://thepiecesofautism.com/uploads/1/3/1/3/131383933/00537e0.pdfIn PDF document text
    • http://coecreator.com/uploads/1/3/1/4/131437920/445629.pdfIn PDF document text
    • http://crossbarpartners.com/uploads/1/3/0/6/130605399/9313df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 10560 bytes
SHA-256: 8dca153817ff5ecb7bbfc1daa29d485d5c9f4811059084e53e8f5723d4d27447

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