Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7b8ddeba9f968a…

MALICIOUS

PDF

93.2 KB Created: 2021-02-14 00:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2a81cf3b6f6213a4ac774ca8c8d125bd SHA-1: 89149c05ac6ea8d435ec55ec0111ced38555fb9b SHA-256: 3f7b8ddeba9f968a38c22fc231f5fc65ec8550713e22e0693fdfa823d3819108
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on disposable domains, suggesting a tactic for SEO manipulation or distributing further malware. The presence of many external links and disposable hosting points towards a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=btd5+bloon+guide PDF link annotation
    • https://kefubawivamati.weebly.com/uploads/1/3/5/3/135304753/260e18a5e7.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/fRAjh7F/percy_jackson_son_of_zeus_and_leto_fanfiction.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/6677458.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/ndjeJM2/51024579763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_601840b29d30d.pdfIn PDF document text
    • http://piziguto.iblogger.org/54750431402.pdfIn PDF document text
    • https://duwujesipegon.weebly.com/uploads/1/3/4/8/134883919/b03b977b9c34.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/chdic6X/one_a_day_cat_calendar.pdfIn PDF document text
    • http://rugavup.iblogger.org/luximutiginenebi.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/Zhcidhb/true_caller_id_private_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_6019cc9a49dc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fd27c767a451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380219/normal_5fc6484fbd32b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovofupokunuda.rf.gd/dragon_age_inquisition_character_creation_guide.pdfIn PDF document text
    • http://wobagelamabix.rf.gd/bododimajonunategoxa.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_off00013452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13452 4820 bytes
SHA-256: a264533241351348f7361bf35bdfdfaaef3750efaaf39ec4b3e2402ab84cb22b
font_01_sfnt_off000144d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D1 10292 bytes
SHA-256: 667fc1efbbf07da74952c2864f10ce0d6cd81dca69ebaf5f333051bdb516f1d3

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