Malicious PDF — malware analysis report

Static analysis result for SHA-256 004a65c6ec2e3d01…

MALICIOUS

PDF

69.0 KB Created: 2021-01-01 03:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1aa7feb80f6e902bb732f66dc390fde9 SHA-1: 7efc3097c9701f40ed71f8889720c7774bf89718 SHA-256: 004a65c6ec2e3d01782bdf3abebb57cdd04056eff87be2fb5ee3e00a587ba35d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The embedded URLs suggest a potential phishing or malware distribution vector, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=lara+croft+go+trophy+guide+and+roadmap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453732/normal_5fba8ab7da0e9.pdfIn PDF document text
    • https://mibivatoroxup.weebly.com/uploads/1/3/4/7/134762409/6736787.pdfIn PDF document text
    • https://cdn.sqhk.co/sawapevodef/kFjegiQ/ronimibizomugi.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/bcb576e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f9654d476325.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/voleba.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/4400388.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/917269.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/Y2sHjf1/82288002127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fca6e452f39f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ee92ac-4d6f-4ae4-8488-d013736d92db/luzojibog.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/nodazolifenolinopam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3d085b-808b-41ae-9d02-7aaf1abbee66/54528235075.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_off0000d06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 5404 bytes
SHA-256: 622d559299b43483349baf43c0fa35fa5b66c1b8e2963e39077aa0a75a0749c0
font_01_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 10820 bytes
SHA-256: 696022eaf54cec9f81bd4dda6b19c8a836f57c6ef2497eb814c84a565868abd5

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