Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bc5a645088353b…

MALICIOUS

PDF

78.5 KB Created: 2021-02-26 16:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 52c4dea8c69a43a5f374b154a13d351a SHA-1: be33c97e41c3924d719a465ea187756c65ed0ac7 SHA-256: c4bc5a645088353b66859ca7c70773b338f2453b17faae04301ada5e69e1fea6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=stihl+ts400+parts+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471948/normal_5fda4036d0757.pdfIn PDF document text
    • http://labiosdewonda.com/dujalalamo6zu1j.pdfIn PDF document text
    • https://suxegetolikas.weebly.com/uploads/1/3/4/0/134097713/sasaxibanowe.pdfIn PDF document text
    • http://zaralutodunuwa.66ghz.com/blue_bossa_chords.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fc8983a9a3b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5fdd5b2e50d7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_60248b621a9d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_602096ece00a9.pdfIn PDF document text
    • https://revelamedif.weebly.com/uploads/1/3/1/4/131437508/vugedudapiw.pdfIn PDF document text
    • http://on24-system.club/rizuribatikalidusexezenarj59vq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_60205f69c345f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459175/normal_5fe4eb1e8c868.pdfIn PDF document text
    • https://mizavujubamu.weebly.com/uploads/1/3/0/7/130775062/gufurapolidam_vawutokuwagata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_6034a094e6b5f.pdfIn PDF document text
    • https://raminatu.weebly.com/uploads/1/3/4/5/134579417/74949.pdfIn PDF document text
    • http://vezerfa.xyz/shakespearean_theatre_and_audiencewhwe1.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/nuxomigo/creature_2011_full_movie_free.pdfIn PDF document text
    • http://misopipe.rf.gd/suzenugidagutoxusowudej.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/asus_rog_swift_pg258q_manual.pdfIn PDF document text
    • http://dokaginiw.epizy.com/43068415572.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_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 5304 bytes
SHA-256: ab42350e84ef68bb14361b7ebd4bdb3dc1f4932150745041cca833e05e1e4b49
font_01_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10776 bytes
SHA-256: c361ac4e3a6366338a9e8ba1b8466696379d1905e260e3ec2389df293b48e05e

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