Malicious PDF — malware analysis report

Static analysis result for SHA-256 534f36ffbd713ca0…

MALICIOUS

PDF

80.3 KB Created: 2021-03-17 08:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1af8af692ab7b541420413881c87ac51 SHA-1: 9dd960ef835cd9f9389a8058b1f138c66962a577 SHA-256: 534f36ffbd713ca0c5feaeb8cafea6d8998a33ac27d5e76e482dbe5bb108c23c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to scanning and technical topics, aligning with the external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=how+to+scan+on+hp+officejet+6500a+plus PDF link annotation
    • http://tamodemuror.getenjoyment.net/the_anarchist_s_design_book.pdfIn PDF document text
    • https://didukomam.weebly.com/uploads/1/3/1/8/131857465/a2fd493ca.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/6817045.pdfIn PDF document text
    • http://f13x.xyz/beseler_model_23c_series_ii_enlargerqrpx9.pdfIn PDF document text
    • http://trysalon.xyz/268186837052l4rk.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/134895353.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/kefuzasi.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/fadokarejipak.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/f7bd42f7fb5a71.pdfIn PDF document text
    • http://strgb2.ru/amended_tax_return_2016_formia1o8.pdfIn PDF document text
    • https://zabavorurexezab.weebly.com/uploads/1/3/5/3/135314693/vijus.pdfIn PDF document text
    • http://botavubapisod.mywebcommunity.org/31597137796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_58463eabc1d2468ea5dda89c089013cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3afd5b8-c5ed-406a-8ed4-a6a718588b1e/cant_program_liftmaster_remote.pdfIn PDF document text
    • https://30cf3496-6c17-4bc5-ba5f-d7c6f2a11da9.filesusr.com/ugd/8ff694_470743eac0fa44d6b18352f32f5a98bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4deba51-29ea-4dea-a078-6718e7dcce95/mawidibipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669fa8db-5537-43b1-a3ea-1ae18963d1ba/34002997952.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_70f815e607244af8807484f918bc8a42.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_9af128d4b9c4410f96bf4a19c4a9a21d.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5556 bytes
SHA-256: efee64c653e2545822ed207ede3ca863019646bd315a65fa32517c2fb813bb32
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 11100 bytes
SHA-256: f51b353df8059cf07450855663251d6bdb55b7dc9f1d38974c8fee08a321d881
font_02_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 16144 bytes
SHA-256: aa1464b36b52ac156dd3ea04bc30a94b8376eaa6838293fad627926ea8981a5c