Malicious PDF — malware analysis report

Static analysis result for SHA-256 3655e936360650d6…

MALICIOUS

PDF

71.9 KB Created: 2021-05-19 07:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a171807b9108a4f75da5f393f3f8484a SHA-1: 7f1caacbd7286074e19df941ee39e821b2112844 SHA-256: 3655e936360650d61abaff06f584592b4ae1a849fc40acd782ba04d5ac0ba717
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://botokaw.ru/strik?utm_term=internet+speed+meter+pro+1.4+8+apk+download+uptodown', indicates a lure for software downloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://botokaw.ru/strik?utm_term=internet+speed+meter+pro+1.4+8+apk+download+uptodown
    • https://zudopawugaweso.weebly.com/uploads/1/3/4/3/134343229/vuzunefo.pdf
    • https://cdn-cms.f-static.net/uploads/4393785/normal_6064b7bed90fc.pdf
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5ff7129637eb5.pdf
    • https://cdn-cms.f-static.net/uploads/4369514/normal_6055ed5f62052.pdf
    • https://fegovelusilefu.weebly.com/uploads/1/3/5/3/135330230/84075d2843f955c.pdf
    • http://menavuselixeba.iblogger.org/vilosijenum.pdf
    • http://kiwepuwefa.22web.org/vizio_2.0_sound_bar_walmart.pdf
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/5952881.pdf
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fdbe86e7c1a7.pdf
    • https://kufavugozit.weebly.com/uploads/1/3/5/3/135309998/medogavudo.pdf
    • https://kobenavu.weebly.com/uploads/1/3/4/7/134714827/kemebutogog-fazofisadogog.pdf
    • https://rolawopu.weebly.com/uploads/1/3/4/3/134317168/temubedusu.pdf
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/3b37c190a.pdf
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5ffa00fb96078.pdf
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/kigigatew.pdf
    • http://tolebexeju.22web.org/figutumidevup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://banigigafizaje.epizy.com/vekulipumebunolapope.pdf
    • https://s3.amazonaws.com/begijufadi/95418587638.pdf
    • https://s3.amazonaws.com/sedowedi/fatonopebuzupubeka.pdf
    • http://sukidagijonola.rf.gd/gigowupenifulemozasi.pdf
    • http://jimomug.rf.gd/aidin_salih_yitik_ifa.pdf
    • https://s3.amazonaws.com/latufenaw/anbe_sivam_movie_bgm_free.pdf
    • http://dufeniwa.rf.gd/medicina_veterinaria_holistica.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_off0000dbbd.bin
a651d2976fad2c0d5f80a21056e3f9f9b6750e1e8a3cd54ef6eb3e166ce96a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 5564 bytes
font_01_sfnt_off0000eeb4.bin
3f1396962a0bf043695e6bc8d07737d27de3c9b7b8b09f83ba41015df4bb7dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 10436 bytes

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