Malicious PDF — malware analysis report

Static analysis result for SHA-256 71240f3a902b597a…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 20:11:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aa2753c9c080cd13d0aa6e1695fe9dcb SHA-1: b26a1463722690fecd88e544833ff08f03cadd0a SHA-256: 71240f3a902b597a1032633055d3a6ccdbf4bdca010a48edb594e6620e5bec5c
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://gimoguvi.ru/award?keyword=qualitative+analysis+of+cations+and+anions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416661/normal_60378019937c8.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/iifQKnt/kapegu.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/EidjcS8/affirmations_for_black_women.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470545/normal_600cad7b2a7b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403819/normal_5fcd433688665.pdfIn PDF document text
    • http://fasafumataluxu.iblogger.org/seteg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_60166017eccad.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/dZic59o/kick_the_buddy_forever_game_download_mod_apk.pdfIn PDF document text
    • http://zonamumajotodot.iblogger.org/facebook_app_for_keypad_mobile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd3224854151.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/6Mjehjx/dozadawokax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476274/normal_6025cbf0ea862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sotatelovutegep.epizy.com/adhd_treatment_plan.pdfIn PDF document text
    • http://pagilupoge.rf.gd/26720086030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365a3d42-9492-4096-9d18-bb4530b64e12/sandisk_sansa_clip_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc07790-cd58-45df-b886-b31ad7e49a12/83166127578.pdfIn PDF document text
    • http://golujaxi.epizy.com/bajrang_dal_dj_song_ringtone.pdfIn PDF document text
    • http://kevefadewa.epizy.com/anatomy_textbook_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44464c82-43a4-4911-8374-df546875fa7e/dyson_dc41_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a19729-c8bc-4763-b128-f385e94befb1/7269136608.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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 5276 bytes
SHA-256: 87686af46e3c80490c93cb32bd0665f1a560895d7d815855851a05442fe36a5c
font_01_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 10812 bytes
SHA-256: daad00c0f0e8ff78d5f120f1e0b65bbd6fe319687d30cbdefb26f0325a951517

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