Malicious PDF — malware analysis report

Static analysis result for SHA-256 c366dc81f15543ab…

MALICIOUS

PDF

77.9 KB Created: 2021-01-11 11:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8bbf69df6afca694aad700275a78ed35 SHA-1: b9698f4c06cd979335d42ec3f663cf605c4a6cae SHA-256: c366dc81f15543abf6fbe4fb8ab0e929d13837c3f8d6582317a2fe212de8a613
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The primary URL observed is https://trafficel.ru/123?utm_term=do+cochlear+implants+need+batteries, which is likely part of a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://trafficel.ru/123?utm_term=do+cochlear+implants+need+batteries PDF link annotation
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/gevoderovepiru.pdfIn PDF document text
    • https://site-1180896.mozfiles.com/files/1180896/gun_strike_game_download_for_pc.pdfIn PDF document text
    • https://kizilezena.weebly.com/uploads/1/3/4/3/134354573/pavugajepavos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_5fbb528b69029.pdfIn PDF document text
    • https://site-1185731.mozfiles.com/files/1185731/professional_website_designer_near_me.pdfIn PDF document text
    • https://tuzokoluxalof.weebly.com/uploads/1/3/1/3/131382257/6bba0a3d3.pdfIn PDF document text
    • https://solovetimu.weebly.com/uploads/1/3/4/8/134879252/tikefogonopo.pdfIn PDF document text
    • https://kuxadituva.weebly.com/uploads/1/3/1/3/131380841/bomaro.pdfIn PDF document text
    • https://cdn.sqhk.co/wogigixa/STXRvhd/sani_cloth_hb_sds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fa1b51119cf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 5452 bytes
SHA-256: 4b5c5420ac30f8961c75cd8e26f9f377b4410768f20dbe7a80cd5dec4661ecb0
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 10328 bytes
SHA-256: 5449fbf6f56a4dea3841f2af15ba23daec344cc88713fdf5b6418586f3130689

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