Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa6418486412c3b…

MALICIOUS

PDF

73.0 KB Created: 2021-02-17 06:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7aff9c74a041ab8f5aebd70477dc5203 SHA-1: a5155cf27c8bf83fa01ade922c3ffcd4260f2c08 SHA-256: daa6418486412c3b92c226458f0855c4301a164c35a5bfcf9f1ace6c62972388
184 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it functions as a redirector to known malicious infrastructure. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lead users to harmful content.

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
  • 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 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=do+you+have+to+read+diary+of+a+wimpy+kid+in+order In PDF document text
    • https://cdn.sqhk.co/bijininabex/eFAIEgj/84320646663.pdfIn PDF document text
    • http://job-finder.space/how_to_calculate_sat_score_percentage_in_egyptyxqpe.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/ibicafE/christmas_bingo_app.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/tchiNjb/20315734382.pdfIn PDF document text
    • http://shmelev.pro/2417429649czhz4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5fe1015dea9cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_60102d4211de7.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/hhhiZAn/arena_go_best_setup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_6024165d59282.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redaxuruzojogod.epizy.com/54883803125.pdfIn PDF document text
    • http://fitadag.epizy.com/80764920343.pdfIn PDF document text
    • http://fosixokosed.rf.gd/pinobaxurotidi.pdfIn PDF document text
    • http://desetezovadu.epizy.com/forensic_files_frozen_evidence_worksheet_answers.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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 5388 bytes
SHA-256: b08289734640497b782469e407ade23423dcccca9c905af599fa33b78dc43cf1
font_01_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 10672 bytes
SHA-256: 76eae67cb1c8e51bb808937148fc91b71e1aa40ad66f0e8bc10dd6969efe8fe4

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