Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a9d6f076230195…

MALICIOUS

PDF

71.6 KB Created: 2020-12-24 20:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 598c19b29b30e4bdc690db706028e750 SHA-1: 1c518d64ed920abe16c2d2bc988b602000838b8a SHA-256: a5a9d6f0762301953c2182a1c0cd03389958b6c887c7ac781963b70e5fb84cda
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and ClamAV detection as a phishing trojan. The embedded URLs and the document body, despite being heavily obfuscated, suggest an attempt to direct users to external sites. The presence of PDF_SEO_LINK_FARM indicates a large number of outbound links, a common tactic for SEO spam or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/aws?utm_term=entrepreneur+mindset+pdf PDF link annotation
    • https://cdn.sqhk.co/sijoputolu/5ichfGv/32733760917.pdfIn PDF document text
    • https://mogiwojijefinan.weebly.com/uploads/1/3/4/9/134900510/zuvaf.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/d2651024-3eee-4610-8e1e-d662d0026302/81586882976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c153325d-205e-45ee-8584-45199a917cd9/zenuzul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8c4a8f-7826-4649-a562-a0839870a81a/60923388025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9cea7e-ca0b-4144-9ca7-b5c807ce7c33/westell_327w_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/arcane_trickster_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b35e232-8ff9-4abe-aac1-caa91a9b18ad/vugezuvipilepasojuris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46dfed67-1862-4ed1-8bb4-3a2d03355014/bios_reicast_retroarch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9679cb0-73ea-4dc2-94c8-a36d34b28e04/comptia_a_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efaaf505-f3c8-4210-83cd-da6d46a4116a/gravity_falls_journal_3_limited_edition_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759200cb-887a-4a7f-bcd6-232a78e15afa/ziziv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48982657-313e-47f2-9ec2-d690852eb237/xakefuperijikopasofu.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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 4904 bytes
SHA-256: fc9eb61c65e58f9f1b77dfb3ce93de68593945d3ffb2b1f82664e30e87e3886d
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 10472 bytes
SHA-256: 8ed9531e1782bccee7ab202ab1639ae79c8b253cbd2e7cb8d02bf083cbbc4802

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