Malicious PDF — malware analysis report

Static analysis result for SHA-256 313f481bf47cc24a…

MALICIOUS

PDF

41.3 KB Created: 2020-11-07 04:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 29471cccf5ffba9de947241cd7deccdc SHA-1: b75af0773cc37ef023e560dbcd2d7700df08a52d SHA-256: 313f481bf47cc24a15b3277c0b52b3e3d43109491f7f681a9d297cf172870a72
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm or SEO spam operation. The primary URL, https://traffine.ru/123?keyword=gravimetric+analysis+lab+report+answers, is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to drive traffic to malicious or spammy websites, potentially as a precursor to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 https://traffine.ru/123?keyword=gravimetric+analysis+lab+report+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459036/normal_5fa396e48ec53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f87331f2831c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f8a2645c0a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_5f9d7ffb90240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f90584eb6791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f8a93999d049.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/kijozikinipufopuxax.pdfIn PDF document text
    • https://wegevarudaredi.weebly.com/uploads/1/3/4/3/134356518/wenexejixulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_5fa12a7386df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5f958a87c78ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/logitech_harmony_950_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/linenejudigido.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/dokoxadivefikeneje.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 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF1 5504 bytes
SHA-256: 69e066f83686543104f8ccbd45a9992b67f6111c1f07e38ac0708a28597ed392
font_01_sfnt_off000071b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 11360 bytes
SHA-256: 8518fa293dd6ea5da7df5f5ef65d0406606918f712ccb072010ceaa40523fa8a

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