Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1cd70d8013e65e…

MALICIOUS

PDF

71.5 KB Created: 2020-12-28 01:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 364da7ff75f4622cc0da6960e76443fb SHA-1: 22531dcf0a1a401c14ab18756c14bcd70abaabee SHA-256: af1cd70d8013e65ec410b6b9977980336127397c2b5a0c9fbc8ae6b58ed7f75e
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 0.9997

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 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://traffnew.ru/strik?utm_term=justin+rex+obituary+friendswood+tx PDF link annotation
    • https://wimuvolerodam.weebly.com/uploads/1/3/4/7/134747149/e571754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5f9777572fde6.pdfIn PDF document text
    • https://xazotanosiwe.weebly.com/uploads/1/3/4/3/134314219/9246860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5fc699bf45bfe.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/gdifjgX/84374759207.pdfIn PDF document text
    • https://rugufixib.weebly.com/uploads/1/3/4/3/134381394/siribukimemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381551/normal_5fc8d257b2ac7.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/db280b38-8267-4cc2-8b9e-c9851ce8faa9/anime_live_wallpapers_iphone_x.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/detonev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8427cf-eaf3-4609-9f03-db50944e4d01/72408897475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8563a2ae-0974-4d18-9a9a-41e3dc6520d7/rust_best_heli_tower.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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 5260 bytes
SHA-256: 677cb1021e189893a51a03878d308caef608877bb15b2698e320bb3c1fa051fd
font_01_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 12032 bytes
SHA-256: cf466f4d624a7656fc482b3b85f35ec7c84765156362793614ac015e0a6f699d

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