Malicious PDF — malware analysis report

Static analysis result for SHA-256 31245f481b21648a…

MALICIOUS

PDF

80.0 KB Created: 2021-01-05 22:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fa7ec674b141d067bff1746ddfac1be1 SHA-1: 70cc4d66117dee1c452908c8fd0053cac0fc07d3 SHA-256: 31245f481b21648a621564b4d5e60ec96769452ef6c6f40d4f98ded3fba0153d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to host other PDFs. One of the primary external links, 'https://trafficel.ru/aws?utm_term=bonjour+apple+inc', is suspicious and likely leads to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/aws?utm_term=bonjour+apple+inc PDF link annotation
    • https://xapaxagi.weebly.com/uploads/1/3/4/5/134506746/5c4e63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425760/normal_5ff2cfdcb42ba.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/vojapu/que_es_un_canal_de_distribucion.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/hepatorenal_syndrome_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/j_c_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686bec83-3726-4475-961b-639eb801f7d7/kingdom_come_deliverance_belladonna_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d20bc45-b5ab-4441-bf1d-c797079c994c/fipekodolani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646907c4-6465-436e-9614-61978128bca5/wekirugopadalipar.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/plural_possessive_noun_worksheet_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d21b4b-518f-497c-a4b7-2b7c027a6ee6/92654271583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70ebf40-5c67-4b55-86de-a618574c3e37/96386703960.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/avatar_musik_indonesia_apk.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_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 4676 bytes
SHA-256: a9d3ffa58cde03dfdf51592e607c4a9550d1f267a3c79034024e23d777874820
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 15740 bytes
SHA-256: 13a80fe8dd6af3083ca197a878d8ca958ca21a0c25c330d8dc3dffa29870c6fb
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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