Malicious PDF — malware analysis report

Static analysis result for SHA-256 7742dc4b3ea15505…

MALICIOUS

PDF

77.8 KB Created: 2021-03-12 06:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f5bbb7624b63eb542d4b8f783d404397 SHA-1: 3a0b098a3f46cbf5295f0e19a5fa5421862375d8 SHA-256: 7742dc4b3ea1550534d62dec1d52baf2602e8f4f9ca18f036712609f604bad51
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or trojan delivery mechanism. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://yafferge.ru/strik. The document body, though heavily obfuscated, contains metadata related to its creation, which does not directly reveal its malicious intent but supports the overall finding of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=batman+the+dark+knight+strikes+again+comic+review In PDF document text
    • http://bobejitamatu.iblogger.org/daffodils_poem_questions_answers_class_5.pdfIn PDF document text
    • http://piguzipudoval.iblogger.org/realtor_magazine_franchise_report.pdfIn PDF document text
    • http://wavosebiza.22web.org/66264341922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejebuta.rf.gd/75230573501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a920a3-e063-4b37-8ca1-cfcca22e8f45/68801171559.pdfIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_aa1cd66e60344b6c816090d7e03181e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db71c593-9b4b-4e7b-b835-27e3e6d36eaa/38146294366.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_8216f6c82f9a4e48bc1523ca97d2d3a5.pdf?index=trueIn PDF document text
    • https://1e2e1d2f-e5bc-406e-8ade-c93a3c5db6fe.filesusr.com/ugd/81c7be_73bcd50d1306439e8732a39eb490e78a.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_53e04d6ad9d341c8b36433347b0f3b26.pdf?index=trueIn PDF document text
    • http://jilerixam.epizy.com/adobe_reader_xi_11._0._23_filehippo.pdfIn PDF document text
    • http://bodotekufuw.rf.gd/percy_jackson_the_battle_of_the_labyrinth_characters.pdfIn PDF document text
    • http://lebuloxa.epizy.com/etiologia_edema_cerebral.pdfIn PDF document text
    • http://lerezivopo.rf.gd/berkeley_group_annual_report_2014.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_4905be4337934959ae49bb50e0378be1.pdf?index=trueIn PDF document text
    • http://nozulabagewena.epizy.com/jitterbug_phone_for_seniors.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_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 5584 bytes
SHA-256: 5722b2d81c6d280a41447251f555f7e23d35df11a6f7c393aa6e1dbccd78d3ef
font_01_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10988 bytes
SHA-256: a9165bfeda5868098aa5e4cf24954d5e1a89f0a3043c05e6dfa87ea7a0da0e4c

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