Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f22bf90eeae40f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 23:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 104d79ef923e7092e4fdc80d0a2e6111 SHA-1: 1325f429512804c52aec541c00183736cf474a8f SHA-256: a6f22bf90eeae40f8ba3f2e7cf5d13379a6ade1d68ea3f5861bf2c996f374b30
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://nipisod.ru/123?utm_term=english+curriculum+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/nexetifosam/heieCcw/66507942731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_6034a1835f8fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454421/normal_60579877e0bee.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/5467630.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwobevina/XHGY119/friendship_stickers_for_whatsapp_wastickerapps_free.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/5267197.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/4ibJhj8/anti_terrorist_squad_shooting_atss_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fd9aa20f09ec.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/ehhmhh2/2709386327.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/iOjbhh5/boy_drawing_painting_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/jcjb4ii/brian_padgett_nevada.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/7d25d39b6e3907b.pdfIn PDF document text
    • https://fimuvuxufubewi.weebly.com/uploads/1/3/4/4/134442536/1fe54d420.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/Jphbvih/buzzer_beater_define.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/agjHNhe/legacy_of_dead_empire.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/e6e0c33b-3449-4f33-a813-f16fa7d5f867/cyber_security_by_nina_godbole_ebook_free_download.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_086b979056dd4613abce20e5e4ee1455.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_10e502da789048bb973176302202f3b3.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_e7ac1bcce1224d2cbd6285ebd2e1ae4e.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_bea20f4a32a246b985ebdb814100b72e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada64960-500b-4fcd-aabd-7aea1760db89/13945989787.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_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 5316 bytes
SHA-256: 92136a5509f938c737cd5e7b12a9ae476cab894b0f3c9dda8917de5cb9892820
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 10900 bytes
SHA-256: cca44f38bd9b35bac7290399fa5c94aaabe182692ab3d279a41442acc78b987c

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