Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab33a15f3cef7ca8…

MALICIOUS

PDF

37.6 KB Created: 2020-06-03 21:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 6d23e4c4a36a4117d8747c3ea539969d SHA-1: 61bb893d8a49a197379b1d9edda744bbeb73a63a SHA-256: ab33a15f3cef7ca844f29d0349b58a52a111cd6c98cb034cf86aee879b15b6ba
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing lures. The document body, though partially corrupted, contains text related to a Greek course and mentions wkhtmltopdf, suggesting it was generated programmatically. The primary heuristic indicates a link farm with many external PDF links, pointing towards an attempt to drive traffic to potentially malicious or deceptive content. The IOCs are the most prominent external URLs found within the document.

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://shreveportpoolcleaners.com/uploads/1/3/0/6/130639535/130639535.html#curso+de+grego+ead PDF link annotation
    • http://fietsencoureur.com/uploads/1/3/0/7/130738528/surelopejit-puwawad-ligojebozuged.pdfIn PDF document text
    • http://suncounty.ca/uploads/1/3/1/4/131452750/dugunifor.pdfIn PDF document text
    • http://fk.undesirable.us/uploads/1/3/0/9/130969027/jawoxaliret.pdfIn PDF document text
    • http://shreveportpoolcleaners.com/uploads/1/3/0/6/130639535/terms.htmlIn PDF document text
    • http://shreveportpoolcleaners.com/uploads/1/3/0/6/130639535/dmca.htmlIn PDF document text
    • http://shreveportpoolcleaners.com/uploads/1/3/0/6/130639535/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://porugisi.files.wordpress.com/2020/05/wakoduvadeniganuwore.pdfIn PDF document text
    • https://lesetexu.files.wordpress.com/2020/05/tamujorinukuxo.pdfIn PDF document text
    • https://pekesobudu.files.wordpress.com/2020/05/gejezebuzopujij.pdfIn PDF document text
    • https://vemupuki.files.wordpress.com/2020/05/77746615283.pdfIn PDF document text
    • https://rivivav.files.wordpress.com/2020/05/roxezamezo.pdfIn PDF document text
    • https://karulirus.files.wordpress.com/2020/06/51968085121.pdfIn PDF document text
    • https://wofopisuf.files.wordpress.com/2020/06/jalenotuw.pdfIn PDF document text
    • https://mivugafe.files.wordpress.com/2020/06/43264023291.pdfIn PDF document text
    • https://fakesuni.files.wordpress.com/2020/06/giwuvexojanedete.pdfIn PDF document text
    • https://mezamug984087245.files.wordpress.com/2020/06/juposukukugexusimibevut.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

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_off000063b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B5 12548 bytes
SHA-256: ea7a9c56ad8773c74afbe7d5db8a576febb0f50f5972578940b28b998eb24036

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