Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcfc85ec383c57f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-24 09:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3fbca3d49ad8340a8f119a51315cffdc SHA-1: 20ec763033db00fb7610e45e727b21b46235ebe6 SHA-256: abcfc85ec383c57f97bb83e6e46b780a43f35dcc86701d0ae4eda2a41b02a7ab
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=stone+soup+recipe+for+preschool PDF link annotation
    • http://beviluxenumiliv.mywebcommunity.org/gesixexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_6005c60f66055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_602a7247d0703.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/e8jd40C/girofexotawujedax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_60144e5fb85d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcee4682ed75.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/mokabuvenevumoduxonulaw.pdfIn PDF document text
    • https://cdn.sqhk.co/samojusive/heEgfgi/tinudus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458125/normal_5fc73bb5e79da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_60338a2fd1e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_604155aec8823.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/Vhgycjj/vevowitobifeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487424/normal_605aa86e3b408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481072/normal_5fee542252cfd.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/UtBieo6/download_free_music_mp3_app_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_60388f73463d4.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/wibedubosateg/24063811047.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_252a8e6ed6fd4e08a6b26a2904e89562.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_2a2d9745e9db4278be450df95691a1fa.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_1f67116431bf402bbb6e2a9a9da5bfe6.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_f522356a0d224684bf481b0ea08bb028.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/99_names_of_allah_video_3gp.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_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 4880 bytes
SHA-256: cbfca360613073d0af72c76a4c48c90dfb57f382a8ac93d4630efb6ba976abda
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 10396 bytes
SHA-256: 9afd17e9568049aee47bff7b981c2ccb6b0736f9bbaf53d62e88f21a18091629
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333