Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49ce50ff38ac912…

MALICIOUS

PDF

85.3 KB Created: 2021-06-06 14:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d236d1b8198e2c993610129a51c502dc SHA-1: a9db0fcb48037a4307338cce4b36addd4dec6fd6 SHA-256: f49ce50ff38ac912dfa18ed8f104da48d5d3cc6dd87c4f3198891b393bc13987
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to potentially harmful content.

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://kuzutuzo.ru/123?utm_term=brand+new+swag+song PDF link annotation
    • https://zerorobasajegi.weebly.com/uploads/1/3/4/7/134751736/00121bba.pdfIn PDF document text
    • https://rakoroga.weebly.com/uploads/1/3/4/8/134887340/bevabipiwinu.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/faluxobozupimewego.pdfIn PDF document text
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/7511577.pdfIn PDF document text
    • https://nezogifoxo.weebly.com/uploads/1/3/1/6/131637357/9950910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_604b316eb83e0.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/newurevosazobajeloj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_600d4b261b7de.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/rilivupejikuzizoku.pdfIn PDF document text
    • https://rawitexebava.weebly.com/uploads/1/3/4/4/134487877/c41292a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e808f46-5ae5-4e1e-893b-2f0b8eb27ec1/best_workout_headphones_2019_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee97c080-a7c5-4e23-a0f0-6db3add295ba/medur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b5059f-14df-4b1d-a9d5-1255fdc9028d/common_pronunciation_mistakes_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bac64e-8ca6-4718-ad46-2f9ed1eccbd2/binewabudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a6b48f-b234-4d3e-adf5-0a22664f4bfe/49946792675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382333d7-1c27-4814-b036-15765905955b/pdf_el_coronel_no_tiene_quien_le_escriba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683cf5e4-1fee-43b6-aea1-8f08ef3e2d20/95075631573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1826fb25-49bd-4bd4-af2a-7ffe73d54452/vurojixedizapebatileb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a4dc6b-d1c6-42ed-9399-dcbe4228a37b/mosaseze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3d1f45-70b0-44c4-a416-265ae0afb499/bsc_1st_year_chemistry_syllabus_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb93a77-645f-4750-948b-38d0736dddaf/how_to_replace_trane_furnace_control_board.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 5104 bytes
SHA-256: 345d718201f5b528036d67ea78dae1d73b6c3dec2af366c62a394efc560c0a01
font_01_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 11216 bytes
SHA-256: f4dee78f6882415dc213eea7754cc96435c941af126e8e5dc2ba97904bf42238