Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f09122c502e0b4…

MALICIOUS

PDF

75.5 KB Created: 2021-01-04 14:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4d4c1e58386280b48965c1fc7cd4a8e1 SHA-1: d1a4e5434d6779ca4e95e0fc581de0b7c4d392cd SHA-256: 97f09122c502e0b4ab8157d672c8e665b539937b3b281cd36bd421e3d6373af6
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, forming a link farm, with one specifically pointing to a malicious redirector. The ML classifier also strongly indicated maliciousness.

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 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.
  • 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://traffmen.ru/123?utm_term=senior+market+sales In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5faaf734772bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_5fbea912f18d0.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/golurawipub.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/kivimapuwir.pdfIn PDF document text
    • https://xukunuwemixul.weebly.com/uploads/1/3/1/3/131384589/zepiwexesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fa3af134126d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jeworurowam/ielts_liz_reading_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b388ecd-9ded-4cc3-bb2a-73fd618d4078/97678476607.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/bizedapageminobofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83b669f-ab0f-4f82-88fe-81642d97fe37/newedofazefejoxetinoxak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f90beb-f3e5-4952-bdac-0b18dcfc5754/holy_priest_healing_guide_classic_wow.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/71761713666.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/pawagogafig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b08da2-0dab-4ed1-9f14-973cc6a44674/47458260274.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 4788 bytes
SHA-256: f415e4cf7ee6b891569c26d722b1b11064e47ade864b66976f2b55a4c17355cd
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 10304 bytes
SHA-256: 72a01ffbdfab8b7eb555b807a36cf56a9bfadc8eb7df5f1bfaea1bd572a24e85
font_02_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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