Malicious PDF — malware analysis report

Static analysis result for SHA-256 810ae986c6ad82ef…

MALICIOUS

PDF

66.7 KB Created: 2020-11-23 23:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 31310b6c61a01dc7d15aedf1c77ab965 SHA-1: b6586aa4404de800e0a46607eb1a0a0b43a81b02 SHA-256: 810ae986c6ad82efed4629ebe800db4004e8ef41dbc4d2865e844daa1f70cd6b
186 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 hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffset.ru/strik?utm_term=nutrition+degree+memphis PDF link annotation
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/lekonumijidabiga.pdfIn PDF document text
    • https://gurivarux.weebly.com/uploads/1/3/4/3/134309953/a5b1b405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f8afe407d73e.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/matesorujutol-wumowaxopi.pdfIn PDF document text
    • https://tawiwamukuzoba.weebly.com/uploads/1/3/4/5/134595143/vabafovaj.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/toxavanilutozoxazid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5fa6c1b68cf47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5f928765446d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5f9878df65755.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/gosaruwemox-nitorananetad-vimolitav-waruxupe.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/6c5e3.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/wetevali/all_of_me_violin_sheet_music_musescore.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/death_note_l_s_theme_sheet_music.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_off0000c93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93D 5100 bytes
SHA-256: e9f0857addcd612927497cecb9da28885b98cedc2a406725b0fdeaf50e6096a2
font_01_sfnt_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 10412 bytes
SHA-256: f6e4ca56a3991697fbe38cb7e8f126bb6b4bc9bc1afb0d8d4b23f1c025c44df2

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