Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c131c336e409962…

MALICIOUS

PDF

88.8 KB Created: 2021-05-31 15:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 79941dacdabfe47f60646f986a3b152f SHA-1: ef6840e7da0d11af0965a91d4ba89a62b62a7190 SHA-256: 4c131c336e4099623f7925857bf87eaf25f0e2a40472a8b5e3d7f0e4f5ae5ea6
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 of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm point towards a phishing or redirection scheme, likely intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://maypoin.ru/strik?utm_term=el+amor+en+los+tiempos+del+colera+cancion+shakira+letra PDF link annotation
    • https://sinekamawo.weebly.com/uploads/1/3/0/7/130776883/d98534b4f28.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/tetol-kivuze-riredojepegof-mijike.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4497358/normal_60b2e1324aed1.pdfIn PDF document text
    • https://kivexobine.weebly.com/uploads/1/3/4/8/134859900/muwozuvok-gulasikisimu-xudefedenuguku-bibokijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369313/normal_5feea0cd724f8.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/ffa8bcb90.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/monegefazikope_sefomujajezom_futimesasidiz.pdfIn PDF document text
    • https://zenimuxen.weebly.com/uploads/1/3/4/3/134317926/dc333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_605df34586690.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366341/normal_60b2eacd0b394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fc7e0ccbcab3.pdfIn PDF document text
    • https://fibetenozogu.weebly.com/uploads/1/3/0/8/130813768/nafunijowibazogakuza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_5ff11897d7006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470836/normal_605472f0aed63.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/1580adca-1a09-4b6e-9aa6-be4cd93d892f/exam_essentials_cambridge_advanced_practice_test_1_with_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb5c5ca-50dc-4de5-af33-74f0d397e83f/hasbro_cluedo_junior_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ab6bf0-cbde-4daf-acba-f6186b020c86/87742370949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca292f46-56e1-4570-b1e9-fb0209de60ca/california_dmv_audiobook_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b7595f-43f4-4d3c-a4f0-23d760d057f1/doresipet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0580abb7-2c97-49ab-aed3-f12ff7567d00/99696811110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31012cb1-3197-48ee-9a29-d60135c2067c/6730024047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbadab71-bd23-407f-b135-482b452cce90/43894858929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2a7040-e437-4f15-9383-00e19535c56e/how_to_describe_affect_mental_status_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cca9678-ac0d-4989-906b-258849c23b1e/nekewofelavalibepasasojo.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_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 5336 bytes
SHA-256: f938a6629ec4f1605f41cba958f7632934fd63495144a5c138f69e6e3d6657b7
font_01_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 2236 bytes
SHA-256: 6a77f955d39b9d81e75477a2b3a68a06f90d7b352a411c8fd057aba46c531b2e
font_02_sfnt_off00012acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 12560 bytes
SHA-256: ab89eb82cd3a8b9a18f0a1f86335e80e222cb30e71f2c77ac9e3b202e52a1fc7