Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e03eb21fc1c020c…

MALICIOUS

PDF

67.4 KB Created: 2020-11-19 06:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a62d8982e4ba18c2c1160d9959b477ce SHA-1: b5d7cefb7209bbc3adbe12d71a93fcda97b438fc SHA-256: 8e03eb21fc1c020cbd4bc1682d3da7278527f96b93d7cb976fdd865a39154dce
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links to external websites, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/aws?utm_term=innocent+defendant+episode+17 PDF link annotation
    • https://jafumusatezod.weebly.com/uploads/1/3/4/4/134485233/602a966e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f9c7232d59f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_5fb2cee20b93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f8ced9f9b08f.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/ad096a5edcc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_5f9bba6af0fa4.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/fabuxuvolibibes-wazivamuje-lumufosak-bapizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_5f9fb8de1d397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_5fa881d1a61e8.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/felasorarabipis/94701795661.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_off0000c01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01F 4880 bytes
SHA-256: e6011b99ce3539821d5c1103f4e82895f2f7cac8a91bd6d7dcb6b2e2467afb9d
font_01_sfnt_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 10148 bytes
SHA-256: e3f621fb250119397563e552bfcec033023b071de443abbe31a9d2a6aacf2fc5
font_02_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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