Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefe9fed7e5ea267…

MALICIOUS

PDF

91.2 KB Created: 2021-05-26 16:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6017927d64ef81ef6dec820691c6b4e2 SHA-1: 9bac1a7e5b5fc4546cb647ef0321fe18fd43116a SHA-256: cefe9fed7e5ea26787802d9799d2007db6054d8d287268b2f7314f0db48eed69
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. 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 embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=the+bonesetter%2527s+daughter+plot PDF link annotation
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/9084149.pdfIn PDF document text
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/vejolevakazuzu.pdfIn PDF document text
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/fojedujofenerad.pdfIn PDF document text
    • https://lufiwusogak.weebly.com/uploads/1/3/4/3/134319395/3c35658cfbf303.pdfIn PDF document text
    • https://sanorasawuvut.weebly.com/uploads/1/3/0/7/130738762/7697cc32420c.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/nojemo_gutiliwidiw.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/dea005fb2a.pdfIn PDF document text
    • https://fudewuwadume.weebly.com/uploads/1/3/0/7/130740250/29f52862f28.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/goniga_tumazeridos_maxoxubipu.pdfIn PDF document text
    • https://tixuxawopor.weebly.com/uploads/1/3/0/7/130738504/843638.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/3493525.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/8cdb63d5-09f4-4935-8c19-bc72c0d8a83e/76593875956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3a858b-6f00-4b5e-a26f-c914265dcff5/16032383651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f4ce03-7dc5-4cc2-9642-c8bd2eb09ddc/words_to_describe_a_forest_ks1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37eb62e-d3c8-43fc-b722-3991d7f210f8/what_kind_of_phobias_exist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b6a1f6-542a-49ed-99b4-70b51670ea82/walmart_black_friday_hours_2020_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4ac856-8364-43a7-b1df-12b1ef465d76/debisarivofujujetak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b4d4f9-1a98-4bca-bedc-3c0dea9ccb5e/porque_razon_salen_piedras_en_los_riones.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_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 5344 bytes
SHA-256: 93d96f4e4a7fdca4f8317288d7fcd7bfaf059af6ef000fd6513907520a9d0058
font_01_sfnt_off00013a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8C 11032 bytes
SHA-256: 8a945d9949ebdd01817e9228845ff8e68b2af0e9b5bf990925d83942e9aea8b7

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