Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8888a5ac4f25ae…

MALICIOUS

PDF

81.3 KB Created: 2021-05-17 04:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 85788d6508968ed020e675d8fab3f02b SHA-1: 942539dfef6dcb71312b2549b0465691b43cdad8 SHA-256: cf8888a5ac4f25aebfcf263a426606f814fe7698ec674fcb8d24bfb579b08eaf
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 0.9998

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://xezojetit.ru/strik?utm_term=diablo+3+builds+necromancer PDF link annotation
    • https://cdn.sqhk.co/dedenijikal/jijbcjc/cabins_near_falling_water_falls_arkansas.pdfIn PDF document text
    • http://bomawowaziwan.iblogger.org/90277843444.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/7igiagc/zong_free_internet_2020_vpn.pdfIn PDF document text
    • https://tubemugipowiw.weebly.com/uploads/1/3/4/3/134345788/dufavamo_vitaratisus_vojaragumaluka_pafurejuxuz.pdfIn PDF document text
    • http://megopoveguvujal.medianewsonline.com/samsung_tu7000_65_inch_price_in_india.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/nederob.pdfIn PDF document text
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/5038748.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/giWaSMI/28099226736.pdfIn PDF document text
    • https://rafunukogavukuj.weebly.com/uploads/1/3/3/9/133999746/590831.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/debejewisele.pdfIn PDF document text
    • https://zixudepapu.weebly.com/uploads/1/3/2/3/132303172/1321175.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/agile_software_development_best_practices.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/ea02ad5d-c210-43a6-8696-75b162c7658d/what_is_a_legal_language.pdfIn PDF document text
    • http://xovimed.rf.gd/34365299451.pdfIn PDF document text
    • http://robeguf.epizy.com/baseball_rules_for_dummies.pdfIn PDF document text
    • http://felugibesixe.onlinewebshop.net/ejercicios_perspectiva_caballera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2323ea-fcd8-44bf-8cc2-d869823c2740/la_biblia_hablada_proverbios_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14940d0-ec5a-4aa4-bfa8-97cd2f31fc23/what_are_social_causes_of_imperialism.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_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 5388 bytes
SHA-256: b71c4d871a7b666e40989b2512e75e6d6cb5e46e3dc06265d7594250d7a1055d
font_01_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 11052 bytes
SHA-256: 93a0febfcc6d1d8e6f0dbc16c0b1c4925abca53b7a34d73b622fa0b428abe24c

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