Malicious PDF — malware analysis report

Static analysis result for SHA-256 655d1d765b08548d…

MALICIOUS

PDF

73.8 KB Created: 2021-01-04 17:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0218c80ee9acb8fc0ee18aaadeb010c7 SHA-1: 9eb580827da849593e8dafa3d0f79504795ab753 SHA-256: 655d1d765b08548def0dfafe6c66d6b5507ffa266135d7261f71679402325b34
156 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 pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO abuse. ClamAV and ML classifiers identified this as malicious phishing content. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious sites or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=buffalo+soldiers+mc+california PDF link annotation
    • https://xanuvomapimiv.weebly.com/uploads/1/3/4/3/134342034/06ab373f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5fb769a8aea39.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/39c24.pdfIn PDF document text
    • https://xodasolilixodi.weebly.com/uploads/1/3/4/8/134874129/bofizapakisew_fuwazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fc687e280706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fa57debaad0f.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/judabusofe-pikes-kudej.pdfIn PDF document text
    • https://fezemopozopedet.weebly.com/uploads/1/3/5/3/135326879/kubawosa_wivupikamo.pdfIn PDF document text
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/5985016.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/tugumeb/jokejuxirilu.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/khurana_anatomy_and_physiology_of_eye.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/bridgeforth_middle_school_fax.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/download_snes_emulator_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/modele_attestation_d_hebergement.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 8

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_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 5216 bytes
SHA-256: abb17c6878abb28f0b683224aba0f9b56c51718153d8cb30aac1a13ffd87595c
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 11284 bytes
SHA-256: 39a17641cf16015744286438658a707ef97090227821f90583c0dba04d3e8bca

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