Malicious PDF — malware analysis report

Static analysis result for SHA-256 87712c5c1c4e9085…

MALICIOUS

PDF

65.8 KB Created: 2020-11-19 02:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 21a8dcf83560fc731ed9c8a72539a677 SHA-1: 9b88909a5d85d6d12c70ed3c5655b7351cd5d907 SHA-256: 87712c5c1c4e90859ef29ef65ae9f04103dc6edeee393d0a42cd2646ef404eb5
186 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. 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 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://trafficel.ru/123?utm_term=ray+of+sickness+pathfinder PDF link annotation
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/15ba8219837d.pdfIn PDF document text
    • https://papuxivosep.weebly.com/uploads/1/3/4/4/134491017/kuzosiwinula_famup_zunej.pdfIn PDF document text
    • https://nakoliveb.weebly.com/uploads/1/3/4/5/134503524/fasokupa.pdfIn PDF document text
    • https://jiwedizuku.weebly.com/uploads/1/3/4/3/134310564/6fadf1f0414.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/tazijizolijuziz_bisez_romovitawara_sabijogajomuwa.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/pimavo_nebixatipebad.pdfIn PDF document text
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/4ec92ce9.pdfIn PDF document text
    • https://zomatofaso.weebly.com/uploads/1/3/4/6/134633851/lisozokel.pdfIn PDF document text
    • https://joxorarosod.weebly.com/uploads/1/3/3/9/133999743/4174402.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/8488417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1e0497dc-aaf6-44f6-9ec0-ffb63594fbbd/ejercicios_de_moles_resueltos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A6 5172 bytes
SHA-256: 3f6b34ec95dc32665dcc1fcacbc2533e233ae88a3758565a52259b10cb796e75
font_01_sfnt_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 10648 bytes
SHA-256: 2635273664e9b954307523ea52484c16561b745d66bb715535b07a453bb7b176
font_02_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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