Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c0b4700b8d94cf…

MALICIOUS

PDF

73.0 KB Created: 2020-11-17 06:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d38e3ec131b06bf10c123b5282a9b38a SHA-1: dc9f430bea6c3709b81da046ee63ee5a53193356 SHA-256: c9c0b4700b8d94cfb3a59cfafbe0146cf3e24ebaf29108bf47aca76c352fa258
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafftec.ru/123?utm_term=amgen+scholars+berkeley PDF link annotation
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/ce82c38c7339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_5fa4594fad224.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/tipikaxe/42702888857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed16607-d17f-4f1a-877d-c2e261535494/40055935361.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/legofomerezijaxenutitewil.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/72658572383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b12a45-7f56-4e23-8757-3c3e6e4ee586/wugiferela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce380d00-c164-466f-a458-98e2001ea3d7/2559485346.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/tibiluxibewonigajo.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/the_raven_edgar_allan_poe_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/vumisetoditibipeke.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_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 5168 bytes
SHA-256: 36932d0bc73f8c4c723d2380225857cb98404d9cb07bed5f8101a3d7d2843508
font_01_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 11292 bytes
SHA-256: 1119684703b44c3a026def883a05743ce13e39d80ff62896b7b2a393798cdc89
font_02_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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