Malicious PDF — malware analysis report

Static analysis result for SHA-256 df834e042306bd99…

MALICIOUS

PDF

71.6 KB Created: 2020-11-25 00:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3dcbad0d669b6f726dae11c8def07dcf SHA-1: 78d79f47fe95ffb31c47e10c716586aa611f4882 SHA-256: df834e042306bd99bdbe67c8761336e6f4e834ed37a477c9b1a034ee87ca17f7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One of the primary external links points to 'traffking.ru', which is likely part of a phishing or malicious redirection chain.

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://traffking.ru/strik?utm_term=kdlinks+a400+manual PDF link annotation
    • https://semezuzuxikazug.weebly.com/uploads/1/3/4/2/134234688/jamudikanu.pdfIn PDF document text
    • https://judunelikirolo.weebly.com/uploads/1/3/4/3/134375477/faloxazo.pdfIn PDF document text
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/rirelebixenepe.pdfIn PDF document text
    • https://bovozamebezunun.weebly.com/uploads/1/3/4/7/134701649/gupupop.pdfIn PDF document text
    • https://dizazulebor.weebly.com/uploads/1/3/4/8/134882555/kenogedakerepen-moximadipulof-zozekitezimomu.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/8331384.pdfIn PDF document text
    • https://solugukaxazazo.weebly.com/uploads/1/3/4/7/134748989/fibadodi.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/feliso/viwijefapaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91238322-8b8d-4254-affa-307f7759da44/my_hero_academia_season_4_dub_on_hulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fddbb7d-bb22-4746-8b1c-a95391df415d/zuxojapiloful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1d8b7a-52b5-473b-887b-0f707515c61b/27564340877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a918f4-8c32-46e2-9ac2-7b3ca663c325/gherkin_vs_regular_pickle.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/wanelolipozumojuwolerogi.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/nutijokodo.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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 5140 bytes
SHA-256: 746af3811f993ee13a75687684e02ed186caabd3a1ee7df9e2dd9c3158c06800
font_01_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 11444 bytes
SHA-256: ba7cfa037490f2da036f681e32f2807bf86d0be3464bf88882ea2230df22ba30

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