Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8f898cbe0cecfa…

MALICIOUS

PDF

74.2 KB Created: 2021-05-13 08:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 74e3c86d7b95a0c922e0af23f1d827b7 SHA-1: 04780072f4b450294120b4c466222a905db682d6 SHA-256: ac8f898cbe0cecfa0b6a7554e463ce48ef9e05da0c4e1607774c7da1933be669
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic indicate the primary function is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=can+you+cook+sirloin+steak+in+a+pressure+cooker PDF link annotation
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/cfec4dfe.pdfIn PDF document text
    • http://kprovk.xyz/is_a_public_relations_degree_useful9vk1v.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/microsoft_excel_2013_free_download_cnet.pdfIn PDF document text
    • http://makamar.tech/how_to_learn_basic_chemistry5qyu0.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/simplifying_complex_numbers_worksheets.pdfIn PDF document text
    • https://zozajiditufex.weebly.com/uploads/1/3/5/3/135309939/jatupes.pdfIn PDF document text
    • http://bositozibab.getenjoyment.net/87879842060.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/limuzax.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/fesiki.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/dobojegove.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/ramubedoxortf7y.pdfIn PDF document text
    • http://1cats.space/anthology_of_american_poetry1bwvb.pdfIn PDF document text
    • http://zeludupixejufi.medianewsonline.com/vde_ar_n_4105_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_907d9915fff44c729d36541e6356a0dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3ebc24-56b8-4047-b50e-f0b5a8697a96/what_is_a_social_construction_of_reality.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/75393399602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b41195-172e-42f0-972e-b49ab4daefad/foundation_asimov_movie_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bb35d9-6402-4deb-a4ee-27166c53665e/17872677599.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/21953285704.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_eebf57f24c824a0394ac1e34e825f33b.pdf?index=trueIn 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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 4996 bytes
SHA-256: 788525b33612aec14d80d57a51b20c7466bf643a88ce3fbf7621ad25adec542c
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 11192 bytes
SHA-256: 031ea39e07c750461fb8e7ba2e1214ec46eb7e744a63b55793c3cbdf836cdd4f

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