Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca18d4c65c1d009d…

MALICIOUS

PDF

77.5 KB Created: 2021-03-06 20:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5b756c3d14e1b9fea28ec6066d215d5f SHA-1: 8193f44d7ce0d2cac5ccf519b11b69e917353ff1 SHA-256: ca18d4c65c1d009dec477b773bb134369bf7fd8dea37ece10798f9d95a8a143c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/strik?utm_term=pathfinder+2nd+edition+class+guides PDF link annotation
    • https://poxovarakegi.weebly.com/uploads/1/3/5/3/135326731/ravomixagazemomo.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/rulep.pdfIn PDF document text
    • https://wiromokuxuzub.weebly.com/uploads/1/3/5/2/135298753/4471821.pdfIn PDF document text
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/dusekepafogekap-folapezo.pdfIn PDF document text
    • https://xojajulu.weebly.com/uploads/1/3/1/3/131382271/xanejibesapopa-tedixenusuraba-vikaruj.pdfIn PDF document text
    • https://borubonaxufiza.weebly.com/uploads/1/3/5/3/135318051/jigonuvozirix-tomege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501360/normal_5fecf07bd30b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_6035c197bc40b.pdfIn PDF document text
    • https://padukasafif.weebly.com/uploads/1/3/4/4/134404544/1236737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375083/normal_6001254a9faf7.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/3f5dcf01bc2.pdfIn PDF document text
    • https://linebabeta.weebly.com/uploads/1/3/5/3/135317009/vemozanoj_rigulilatake_puwigejif.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/b7bb2306-e40a-42ed-b24c-553baf22768a/how_to_draw_digitally_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8da06a3-be64-45e4-b158-5ec785ad4f02/81071603587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce06e667-c689-4b3c-9e72-4a614a6c9a76/15343583888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab18bbd-ff35-44bc-a2c8-fc50fd49b31d/lord_of_the_flies_movie_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589266b4-aa5e-4a11-9d32-51a638e65431/panda_express_orange_chicken_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb5a866-2475-4d62-88c9-a945f0aa716c/vozedef.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/antivirus_para_android_gratis_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/tigovefixabosakiravir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea41d762-ecb7-4d9f-9c65-f4f9499f3cc1/what_is_the_order_of_operations_rule.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/saudi_arabia_visa_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d162b832-5028-433e-b759-ddc6c0bb94ad/rufejomul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669eff24-73b5-42ec-b9b0-e5b73b7de5b2/76546767478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e29654-7438-469d-864a-d299f7d3d3eb/cloud_security_alliance_survey.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_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 5416 bytes
SHA-256: 9916791b05f5c39d81d73dbac544690cb284cee980dd57c4b6110514265375dd
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 10344 bytes
SHA-256: 8b8a591366692ee9c2980c739ddbe9504a976c12a5ea1e85e5ec32510398c768

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