Malicious PDF — malware analysis report

Static analysis result for SHA-256 0739893a0fbe248d…

MALICIOUS

PDF

82.5 KB Created: 2021-04-07 11:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a6f7f83cd0614731a09a2c8d55db21c SHA-1: 59365902d6ac469fc8d48ab8de4780a9c67cea53 SHA-256: 0739893a0fbe248dbe1076ce48f0310c0de489d1fdc36a06e5b4c9382271f266
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm designed to generate traffic or SEO manipulation. The primary external URL identified is `https://bologen.ru/strik?utm_term=how+to+day+trade+options+reddit`, which is likely a lure to a malicious or spam site. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent related to link manipulation and potential redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=how+to+day+trade+options+reddit
    • https://cdn-cms.f-static.net/uploads/4489247/normal_606b47047ba9d.pdf
    • https://static.s123-cdn-static.com/uploads/4417221/normal_6005f6987e6f3.pdf
    • https://cdn-cms.f-static.net/uploads/4481836/normal_605889038dd72.pdf
    • https://zamokofoviwikaz.weebly.com/uploads/1/3/0/8/130815095/025b82da4.pdf
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/6aa772a8.pdf
    • https://cdn-cms.f-static.net/uploads/4466996/normal_60504f05ca731.pdf
    • https://jibogikufojubu.weebly.com/uploads/1/3/1/4/131438018/90624c60.pdf
    • https://wuxudizujo.weebly.com/uploads/1/3/1/8/131859042/38f60.pdf
    • http://fibisazorowax.mypressonline.com/upsc_sociology_optional_question_paper_2020.pdf
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/seravojatesoxarapaxu.pdf
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/7342753.pdf
    • https://cdn-cms.f-static.net/uploads/4426686/normal_605ee1c10ab6b.pdf
    • https://static.s123-cdn-static.com/uploads/4411922/normal_5fff4fe805aeb.pdf
    • https://cdn-cms.f-static.net/uploads/4465557/normal_604c9970ac206.pdf
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/rasigap-fevofipufozevi-rurejo.pdf
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/bowiselowix.pdf
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/0da0a51.pdf
    • http://futajef.medianewsonline.com/zigokakatex.pdf
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/3ce88736.pdf
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5fe9f14cf1f32.pdf
    • https://cdn-cms.f-static.net/uploads/4375896/normal_6039c80ead79a.pdf
    • https://cdn-cms.f-static.net/uploads/4493916/normal_60490d28a1431.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bupesejirijejus/closing_letter_for_incident_report.pdf
    • https://s3.amazonaws.com/vifusupegiza/moteweji.pdf
    • https://s3.amazonaws.com/wusone/creative_resume_maker_online_free_word_format.pdf
    • http://gozenabuzixi.onlinewebshop.net/f5_o365_deployment_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010323.bin
4805bd1eccb61043e81f396ecd617f01967a55330a98b2fac2804e06a168dca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 5076 bytes
font_01_sfnt_off00011489.bin
7806dd5ea6c47b55cab22c750fd6a75fc1232b3887fe105a1e9202aacb936c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 11716 bytes

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