Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb6d7617fc39601…

MALICIOUS

PDF

74.7 KB Created: 2021-02-24 05:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fbd371f2e8a59e6c143feb2087e2e622 SHA-1: d7a66d17dac1f3cd9c228bf79a997133b218cec8 SHA-256: acb6d7617fc396017ef5d4f19a582797c5effebacacf40e55716afc0dff25987
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The primary attack pattern involves luring users to external sites, likely for phishing or malware distribution, which aligns with Spearphishing Attachment. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/123?utm_term=king+lear+act+1+scene+4 In PDF document text
    • https://fosarujup.weebly.com/uploads/1/3/4/6/134624161/mabetafebaxevenupodo.pdfIn PDF document text
    • http://idem-peshkom.ru/13508386583hxd4f.pdfIn PDF document text
    • https://pudogujapoveg.weebly.com/uploads/1/3/6/0/136090910/fibututulelixi.pdfIn PDF document text
    • http://wei-nmvc.com/location_khalid_sheet_music_pianooyr4h.pdfIn PDF document text
    • http://itwow.info/tigazaj62kuh.pdfIn PDF document text
    • http://portkamesto.site/690974322727nrk2.pdfIn PDF document text
    • http://wuxapogetal.iblogger.org/nepaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_6009667b956fb.pdfIn PDF document text
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/wiletulijejikume.pdfIn PDF document text
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/0d1b067.pdfIn PDF document text
    • https://dupopawo.weebly.com/uploads/1/3/4/6/134652833/pazeseg.pdfIn PDF document text
    • https://dupukaradox.weebly.com/uploads/1/3/6/0/136015529/molifibofinat_niwaxuduz_gadalin_fiwazotarulabup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/34047893130.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/formal_complaint_letter_to_school_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/appositive_hunt_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/jezub.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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 5076 bytes
SHA-256: 2c0d0a9efe71b2490de54bb0b261597dd07f2095405d1a7afc9c7dd5ce339eb2
font_01_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 10136 bytes
SHA-256: 2809c672c7cbc8635a514295455439eb9b990d2a18265be9ea6c28c2f77f3071

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