Malicious PDF — malware analysis report

Static analysis result for SHA-256 984616bf5936327f…

MALICIOUS

PDF

62.7 KB Created: 2021-02-25 13:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 38c0104056c7e11869d6cd18030404f4 SHA-1: c00c6ddabce328b8e173456412523304cbf9c98e SHA-256: 984616bf5936327fbcfae5d317a255a267c9863db1a7fa5533eb7b78654580eb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to other PDF files hosted on various domains, many of which appear to be disposable. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers also flagged this file as malicious, supporting the phishing and trojan detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 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
  • 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://bologen.ru/award?keyword=my+beloved+world+book+discussion+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5fe69850e366f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368962/normal_5fde90eb0315c.pdfIn PDF document text
    • https://fanesorugetefex.weebly.com/uploads/1/3/1/3/131383934/gegimudovo_fuwog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd31d9107499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461763/normal_5fe412434cdf0.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/munafi-mibamajidem.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/1ebc4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_601783f78c041.pdfIn PDF document text
    • https://mesitumavitolo.weebly.com/uploads/1/3/4/8/134866133/8657677.pdfIn PDF document text
    • https://cdn.sqhk.co/zufutetuwume/jcEidUR/mathew_brady_civil_war_photos_antietam_battlefield.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/jigfrlq/37501837147.pdfIn PDF document text
    • http://copyrightviolationcenters.com/verbos_regulares_e_irregulares_en_presente_y_pasado_simple_en_ingles_y_espaolu29jg.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/b9heTgd/voxenufagikufagudu.pdfIn PDF document text
    • http://potenciy.xyz/63208630577cz0qp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5ffed049ceb9d.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/hdahgjc/91736334449.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/jemijavetotida.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/2279971.pdfIn PDF document text
    • http://septiki-rf.website/archery_mule_deer_hunting_south_dakota2fk9w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 5196 bytes
SHA-256: 7759782933ef56fd6da192965dc06b1b6a15b14a388d3f3c24448a23a8504382

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