Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b21039c483cbb46…

MALICIOUS

PDF

79.5 KB Created: 2020-12-18 01:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d193ab1c078cb709fa30defad4afa7b6 SHA-1: 1ffdf2295452b99de8808e40b802cf872b934272 SHA-256: 3b21039c483cbb4665d0d2ab5c5fb8374bdd7c9a4c15882a5de5ccf0097df720
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, with a primary URL pointing to 'traffking.ru/strik', suggesting a redirection or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates the document's structure is designed to host a large number of external links, likely for malicious SEO or to distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=my+achy+breaky+heart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5fc73a876a7af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_5fd241df3a2b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_5fb48add121a1.pdfIn PDF document text
    • https://kesafukiwunutab.weebly.com/uploads/1/3/4/9/134900694/wolulijip_mabowokove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f90e08398887.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/cd3619fef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5fad218e330f1.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://uploads.strikinglycdn.com/files/79cfaf9a-d9ea-4249-8cda-a170ed8c553f/59401950025.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/kuwupibapimukejupofevugag.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f24c403f5353fd95fd42/t/5fc823f546ef2e08cbaa2572/1606951926139/video_player_all_format_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/fatiwejulogo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc013fe3398ff751529adbc/t/5fc158e3f81c9a2a0cd45f77/1606506723506/jovexaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69c72ef-19ba-4f10-9f17-2ab34a9a0eac/56396051399.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0f3ceaf37e3b64634ab4/1606291261441/jotun_boss_guide.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_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 4512 bytes
SHA-256: a0fcfed15892e161845350274d2a81404cedd8263085fbe29e4f8954d929320b
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 17708 bytes
SHA-256: 093d61108e06ad47a049a42c73c0dc903ee9fef770a8ecfbc9a31a193ac43941
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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