Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d5a56f586b8d18…

MALICIOUS

PDF

38.4 KB Created: 2020-05-15 05:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 6ba1399963186e72083b6ff4e390cd2a SHA-1: 7fa2775f3d6a924a53e3f9480b1a1d2818a1db06 SHA-256: b3d5a56f586b8d18633baba248c3db57c6bd437498f62e950868aa7e2a9e3a7d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, indicating a link farm or SEO abuse tactic. The primary heuristic firing, PDF_SEO_LINK_FARM, confirms this behavior. The embedded URLs are likely used to redirect users to malicious content or phishing pages. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://sensationevents.ca/uploads/1/3/0/4/130490875/130490875.html#pdf+ocr+adobe+acrobat+standard+dc PDF link annotation
    • http://anthologycollection.com/uploads/1/3/1/6/131636753/kitaliwoko.pdfIn PDF document text
    • http://gainsongains.com/uploads/1/3/0/3/130323581/8739500.pdfIn PDF document text
    • http://blackjade.club/uploads/1/3/1/8/131856710/2302c.pdfIn PDF document text
    • http://mrtilingstoneptyltd.com/uploads/1/3/0/6/130604701/tarisutis.pdfIn PDF document text
    • http://npeg.eu/uploads/1/3/0/6/130604127/xiwojudite.pdfIn PDF document text
    • http://vitalvantage.com/uploads/1/3/0/3/130379126/lazerovetebes.pdfIn PDF document text
    • http://raldas.com/uploads/1/3/0/2/130287939/zomiz-lenejolefumiwa-lunosujo.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 3

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_off00006a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A23 10696 bytes
SHA-256: a4c5e22a4b76372497d6fed662780b04004e5d9499f1bc7efb18b247d5d273ad

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