Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d16c288125886a…

MALICIOUS

PDF

72.1 KB Created: 2020-11-18 04:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7060e14354979d1b6338a4e8c05934cf SHA-1: daba9ab8d082d7fc8af2b09a64e1c92b404f1737 SHA-256: a1d16c288125886ac31a04e7bd609f88b941b6dd31a4e535470aefb2483d01f9
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffnew.ru/123?utm_term=vehicle+safety+inspection+checklist+pdf+missouri PDF link annotation
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/sunafolijifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_5f9e2009bd97f.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/efea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f89f0ae8ff9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fad79e0402d0.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/2583745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5fa73b3d00c04.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/givigugi_guzaba_gapagixopefif_gevugevatikita.pdfIn PDF document text
    • https://ginefudev.weebly.com/uploads/1/3/4/4/134454890/sapuvisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f9a5973aef17.pdfIn PDF document text
    • https://gekubunog.weebly.com/uploads/1/3/4/2/134235395/8d9e8a04a9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_5fa45fed8b53a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa4af55-28e0-491e-81a6-652686f6ceb7/55639265154.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/67272554854.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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 5528 bytes
SHA-256: b1517571285cafed2c1954ca7682052671cb1248a735dc252215d50a38e3bf7a
font_01_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 10888 bytes
SHA-256: 756ca9929dc66e67ebd498b910e025ae3df74f69c808bb16585c0e91bb7c3cdb

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