Malicious PDF — malware analysis report

Static analysis result for SHA-256 a612242baf9f1bfb…

MALICIOUS

PDF

42.7 KB Created: 2020-11-09 12:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 99b5f28ea9fd00d0d83a41d97e32fdde SHA-1: d80777bf0d0d7386645c1d66e32155b7b0847121 SHA-256: a612242baf9f1bfb7d77b9d5abae7b094b12e4de0af1fb6110fef31cfb1e58c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?keyword=2016+volkswagen+jetta+manual+pdf PDF link annotation
    • https://vefubonipit.weebly.com/uploads/1/3/4/7/134719522/perazibituwola_ganotu_vivan_tojaxuxegesidoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_5fa6955fd1550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f89ecfa23f01.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/lusowopelaz.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/titefagat.pdfIn PDF document text
    • https://turamuko.weebly.com/uploads/1/3/4/4/134458704/zezonowag_kemupudikajure_sujonewuvojeme_xegaxavus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5fa465a9c4b16.pdfIn PDF document text
    • https://lipebelotoj.weebly.com/uploads/1/3/4/4/134475440/41d7b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f8ffbcf7770e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c2e1a1-a52f-416b-8ecb-9703788d4c02/wovadebewimanadipikakuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/vintage_snowmobile_track_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557f4831-f3ce-4c8c-a27e-8a7e0fd24493/kodovutudijipavidiwovar.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/gatid.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_off000064b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B6 5940 bytes
SHA-256: 198d93a62abe5966fa8759abc68604907eaa2fb89ac509d7f3acdafcaeaa15e9
font_01_sfnt_off00007904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 11056 bytes
SHA-256: b8ec55063d1594a38800123fd171ce0d2317837e60a82021e938a5ecf277613c

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