Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafaa2c1b80e4bde…

MALICIOUS

PDF

78.5 KB Created: 2021-03-06 06:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6c8cb5171d416ebb3d9c260ff3e99ec1 SHA-1: 2b9f0279cb02e7cb6384bc7980aa23f404a67781 SHA-256: cafaa2c1b80e4bde7bcfda5839f21ca2d93a2751ef2675a3d6e63cdbeb324f5f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/wix?keyword=chapters+interactive+stories+mod+apk+android+1 PDF link annotation
    • https://cdn.sqhk.co/samekikogeri/lhhgjhe/61439538161.pdfIn PDF document text
    • https://cdn.sqhk.co/kujaruwajovi/b6UgfjX/merge_tower_defense_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_601da9dd3390f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503767/normal_5fee3606382c1.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/jezorizisudufeg.pdfIn PDF document text
    • https://kekixulup.weebly.com/uploads/1/3/1/4/131407102/mowade.pdfIn PDF document text
    • https://juzunuxav.weebly.com/uploads/1/3/4/3/134316531/2561089.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/jgfDjr6/archero_talents_order.pdfIn PDF document text
    • https://dajoromu.weebly.com/uploads/1/3/4/3/134309711/753776.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/41AwLgc/72826815185.pdfIn PDF document text
    • https://kekuxepepave.weebly.com/uploads/1/3/0/7/130739312/20868f3.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/ihfhiXd/65380234642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5feb089782517.pdfIn PDF document text
    • https://detofupupe.weebly.com/uploads/1/3/1/3/131384021/d82691.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/gLjehaG/car_gear_shift_locked_park.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372373/normal_5fff92b5859d9.pdfIn PDF document text
    • https://kotepavugenufe.weebly.com/uploads/1/3/4/5/134592782/viwaredi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_b3f0bff3e9c64f70beced94eb05a88bd.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_601e45653ced4d4b9ee7c76c500004a9.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_b91a8c16194f4dbdac97038c0e68791e.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_c376df255f694e298b2607fa48fcfb17.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 5364 bytes
SHA-256: 5a96b4bb65e566f75d5a52f681e55c4ac486c290a37f28e5825b76478e6d8e17
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 10184 bytes
SHA-256: 26cdc133a09581046be94f9504aaf39cc349e50346401558aa0c35c3838eb2cc