Malicious PDF — malware analysis report

Static analysis result for SHA-256 935c980cf8d587ba…

MALICIOUS

PDF

44.3 KB Created: 2020-11-07 15:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 885b195a1a975e7567561f8b4cbdaccc SHA-1: dce468412a787b0ba3b6777e084df97972237126 SHA-256: 935c980cf8d587ba4672f2ccd58282024f131a2dc156bf7b4eed575544dbd680
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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=the+theme+of+the+lion+and+the+mouse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5fa104dba5137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_5fa08b1f41079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5fa2d7ec24b8f.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/gajabedafot/gotugus.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/hs_graduation_requirements_in_georgia.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/giinii_thermometer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f958a4ef-c64e-4af7-8a8d-298523a73631/gotham_steel_smokeless_grill_infomercial.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/38360918596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb633fe-243f-40b7-98dd-7a980cf17f3b/kiwufudekojitevuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/tofuseve.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/29741260071.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/kenoluno.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED6 5000 bytes
SHA-256: aa037e591b66784daf68d17b643e37fce4f2e654b699fc65375a55eb274230aa
font_01_sfnt_off00007fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAD 11112 bytes
SHA-256: ecb17e649ad18dd77b978b1c3c5324b1b171e3f7338be8540d9ebda7e85ddd40

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