Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2a8653d096b09e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 17:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aa93978233a4b637b4d82cd0af2c4e25 SHA-1: c9519727febecda8918a3765b0512016903afd31 SHA-256: 5c2a8653d096b09e911839dc6dc0c5e076d116d29594719d8767b956049f8a9e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used in SEO poisoning or phishing campaigns to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

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://maypoin.ru/strik?utm_term=how+to+use+a+gas+fireplace+with+a+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fd6a7f3b5948.pdfIn PDF document text
    • https://safodejinuvi.weebly.com/uploads/1/3/4/7/134753113/c8f05a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_602c69debdfc5.pdfIn PDF document text
    • https://rosavipufek.weebly.com/uploads/1/3/5/3/135315232/5f876a968a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fe66dac15cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_6026a7263fa17.pdfIn PDF document text
    • http://fapenas.22web.org/retimin.pdfIn PDF document text
    • https://nixodogal.weebly.com/uploads/1/3/0/7/130739919/2004af0da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5feaefeca8a4b.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/vukujidor/christopher_c_doyle_books_free.pdfIn PDF document text
    • http://juvotam.rf.gd/bepekilag.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/65291149293.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/89240024272.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/51551756564.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/5112628019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf545a8-61b9-4a05-9820-217e35c24173/61556415833.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/fivadetumef.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/maths_pictograph_worksheets_for_class_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df05a27-e336-4c4b-9b70-90bd3886ea04/hace_cuantos_aos_esta_el_ser_humano_en_la_tierra.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/turkish_march_piano_sheet_music.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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 5272 bytes
SHA-256: 9fb1a6dac0dd7c8c454c7bb40945b1e88d190e27c38655fcc49238d0f082af8c
font_01_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 11124 bytes
SHA-256: 4908599d4ffa23e2d72233c2ae8645c78c0711ce123a417ba4aa7fc62adf519b
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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