Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc4768137601d7a…

MALICIOUS

PDF

84.7 KB Created: 2020-04-11 00:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 65f5b54e2fe075a1ffc757b03c0456d3 SHA-1: 22dc706bb1e3ddf3eb67021bc188f723ae5c6371 SHA-256: 1fc4768137601d7a7d115513637c5f447ce413e837ed8befa6df1a4363df875c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, a technique often used for SEO spam or phishing. The document body, though heavily obfuscated, contains the text 'Nematodes in fish tank' and references wkhtmltopdf, suggesting a lure to unrelated content. The presence of numerous links to domains like '7levelselling.stefanaarnio.com' and 'kristinnevans.com' reinforces the attack pattern of directing users to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://7levelselling.stefanaarnio.com/uploads/1/3/1/4/131483361/131483361.html#nematodes+in+fish+tank PDF link annotation
    • http://kristinnevans.com/uploads/1/3/0/3/130323522/lerozeridovuw-kevowo.pdfIn PDF document text
    • http://misogi0001.com/uploads/1/3/0/7/130740264/6300bc4.pdfIn PDF document text
    • http://lizaladybug.com/uploads/1/3/1/4/131408099/275013.pdfIn PDF document text
    • http://hempliving.us/uploads/1/3/1/0/131069887/9802879.pdfIn PDF document text
    • http://rocketleadsconsulting.com/uploads/1/3/0/8/130873941/lekutegaretiso_vilakozere_ritigi.pdfIn 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

Related samples 7

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_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 9372 bytes
SHA-256: cb66dad22ab5ee2982e526e1a21aa350123592b335c2980c06861135f439ce02

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