Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2f0f8f16fcb403…

MALICIOUS

PDF

63.2 KB Created: 2021-02-25 12:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 36e22596dc66036283d8c682e114b19b SHA-1: 2c3e2fee017978d933de76d2c07e2752f6c3b9c2 SHA-256: bc2f0f8f16fcb4038de131238a844c2bd3960930aa13d1b797571028991635c5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to printer ink, suggesting a lure for phishing or malware delivery. No scripts were extracted, but the presence of malicious links is sufficient evidence for this attack pattern.

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
  • 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=epson+xp-320+printer+ink In PDF document text
    • http://letnesil.xyz/37259081066h4dqk.pdfIn PDF document text
    • http://bofesota.66ghz.com/law_of_contrapositive_worksheet.pdfIn PDF document text
    • http://hiziryigit.online/2690949735411hqu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415326/normal_6008ddbe28dd6.pdfIn PDF document text
    • http://micrometer25bill.site/amazon_canada_mens_golf_clubsiq41i.pdfIn PDF document text
    • http://rolevuses.iblogger.org/ccna_cyber_ops_lab_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_602ac9afaa38b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisoparumunezud.epizy.com/93458026972.pdfIn PDF document text
    • http://batitesejikak.epizy.com/sakozopatitasowulopan.pdfIn PDF document text
    • http://fazawafelu.rf.gd/starcraft_camper_sales_near_me.pdfIn PDF document text
    • http://pijiwir.rf.gd/42823685803.pdfIn PDF document text
    • http://putojoner.rf.gd/arbitrage_international_formation.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/true_to_the_game_book_release_date.pdfIn PDF document text
    • http://dufowuburaji.rf.gd/how_to_use_rca_portable_dvd_player.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 5128 bytes
SHA-256: 70ceece6ee6d1f87ff54ce99a39ebe17ca73668bf0db1b59a6cc45e736cb515a
font_01_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 9352 bytes
SHA-256: 70926dc6c2a8d8dfa33e10b664d45d5458a165594f56233c8c14a83bbccf8fd4

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