Malicious PDF — malware analysis report

Static analysis result for SHA-256 67deb4ad05fd7e79…

MALICIOUS

PDF

71.9 KB Created: 2021-01-04 07:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c0d6f18dbe0aa47c6ec6ddcf9cf32d72 SHA-1: 9217f714432d1071b748c512065bbb23a3c388d7 SHA-256: 67deb4ad05fd7e795a3ed7b17dc7b6912fdbd68b394e27ac712a69170a4ea3f8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL pointing to 'trafffe.ru'. The document's structure suggests an attempt to manipulate search engine results or direct users to potentially harmful content hosted on various cloud storage and disposable domains.

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://trafffe.ru/123?utm_term=food+safety+books+free+download PDF link annotation
    • https://cdn.sqhk.co/vebiziwob/9jbiegj/adidas_swingman_jersey_vs_authentic.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/vibabi.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/711cb6.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/1222027.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/blG2vha/konamela.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/dvhh8Bb/59655431486.pdfIn PDF document text
    • https://tezexitebab.weebly.com/uploads/1/3/4/6/134600353/d15eb992.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/jenujaba_roforaliso_maxelekafimiri.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujakosepa/eidlHgh/slice_ice_iphone.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/mogipegi/formal_accusation_legal_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb44fd9-bcae-45b0-8f3f-56cec738cea4/bajillion_dollar_properties_season_1.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/58427042594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8db82c-b4c2-44ba-ae4f-878a69daef12/wizizixumosopejilemoxem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced671c8-0215-45ea-abcf-283307125ea3/fat_rhonda_that_70s_show_actress.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/stop_bullying_worksheets.pdfIn PDF document text
    • https://medlineplus.gov/foodsafety.htmlIn 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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 5256 bytes
SHA-256: bfabc90f232e98b3c3e7e5ae9063e83e45a36e0408e2f424aa2a476936e7b77a
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 10792 bytes
SHA-256: dd9dad3ad4fc17edb7976e1eea99d8b288549398d02dc5156280554964cabf14

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