Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bd001b872bef58…

MALICIOUS

PDF

82.0 KB Created: 2021-04-04 02:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5e0e959cfed00864c548c56ab473a399 SHA-1: f431fae959bf387b793c51954db3d4fcadfa08fd SHA-256: 74bd001b872bef585105de3dc64eb6944dda02200e3d6abdd46747a045d28a6f
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 domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://xajibur.ru/strik?utm_term=how+much+horsepower+does+a+125cc+pit+bike+have, which is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=how+much+horsepower+does+a+125cc+pit+bike+have PDF link annotation
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/7ada5.pdfIn PDF document text
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/2199373.pdfIn PDF document text
    • https://rarejitidod.weebly.com/uploads/1/3/5/9/135993923/nuzobubadinusinar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_6036cce11744f.pdfIn PDF document text
    • https://kuduxefu.weebly.com/uploads/1/3/2/6/132695679/kisurobamajonugina.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/kiridazuneduba_xolajiposaj_vurewop_volumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_605a2ea820b7f.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/1118316.pdfIn PDF document text
    • https://sovirufumidek.weebly.com/uploads/1/3/4/9/134902413/kavizimofunoledax.pdfIn PDF document text
    • https://guverududilo.weebly.com/uploads/1/3/6/0/136086053/1582528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fe7101490fa7.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/1dc08753-c323-44de-8caf-bdeff9cc1fc0/73282961408.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_581c171a64454ef78b57952568741bfa.pdf?index=trueIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_ca561fbcea1e42a89ef2aab3831f279d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f7e2e2-0878-4f29-beac-4f1bb53d676c/the_magicians_season_4_episode_10_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c318922e-f441-4e82-8409-0aa39cbf4845/acer_aspire_v5-571g_bios_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09bf99f5-f1e3-4048-9207-18be6aa12031/discrete_mathematics_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc141ce-dac8-4d51-a58d-4bc7f6e9df06/35636538681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2507bfe4-083d-4bd4-ad32-7ef2b3f4c164/best_sites_to_learn_coding_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e51c0fc-283a-4bd7-b28b-11192a5eae25/zakeguzerabukedojemigaroz.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_aec1c06430e64947ac4d1b138e167d03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a882b66-fea0-4f79-8ac9-db84e9a2e48e/jubaxuvosejubeju.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_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 5904 bytes
SHA-256: 281c02a3dfbb1f36f67781b1807338eccec2a41ad8f6a0fb93be72a64f9a4ed0
font_01_sfnt_off000116d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 10468 bytes
SHA-256: e1b4d64e4565202967e45b18842a58981c9d061ee8a41438da6bd0d9d4b115fb

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