Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfca7c3247a82663…

MALICIOUS

PDF

79.2 KB Created: 2021-04-04 03:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 073600829b49b23053c24fc6be2bf61b SHA-1: e04eefff60bed807a88293086ce6f1a95fce41cd SHA-256: bfca7c3247a826632887daa9f1c9eb654311d9327b1b7492cfb8b11baae26b8d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'botokaw.ru' that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of multiple external links and the overall detection profile suggest it acts as a downloader or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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/wix?keyword=direct+variation+worksheet+9th+grade+with+answers
    • https://cdn.sqhk.co/fixakozumad/jdgHhjX/zokojofadanepaduzitu.pdf
    • https://static.s123-cdn-static.com/uploads/4454162/normal_5fff99292554d.pdf
    • https://cdn.sqhk.co/bavozazav/AjPRgim/49144169385.pdf
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fcfa43a94ddc.pdf
    • https://cdn.sqhk.co/zatejurix/9YjctnT/56589501329.pdf
    • http://gokawojop.scienceontheweb.net/golilifatadunipaj.pdf
    • http://tuduvodakep.mypressonline.com/bwv_1058.pdf
    • http://malolufixanovas.sportsontheweb.net/93037234999.pdf
    • http://modozadubop.mywebcommunity.org/3708451803.pdf
    • https://cdn.sqhk.co/poxudanefisi/ccicxgg/gafosedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_43538301bbab4d64af768dfd9689a5bd.pdf?index=true
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_d8a56e72ff044175ad08d1175eaf0abc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/963789e2-9d4e-490e-8a97-7b9f4272ce8d/what_does_it_mean_if_a_contract_is_voidable.pdf
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_8e01bc0375544b14b73a970012de4348.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2822b043-f36c-44fb-bd04-e5123c33f0ea/pugalibibo.pdf
    • https://uploads.strikinglycdn.com/files/480afae0-7cfe-4d09-87df-7ef162d9e810/harbor_freight_6_gallon_air_compressor_review.pdf
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_8461c4015190400ba3919d7c175d526b.pdf?index=true
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_142d7a827244498a8527af03e43d5e00.pdf?index=true
    • http://xawiwevivuzox.onlinewebshop.net/ranebuf.pdf
    • https://uploads.strikinglycdn.com/files/bf353a41-5bd7-40a6-8caf-ce66958371ce/75197625886.pdf
    • https://s3.amazonaws.com/kaxukok/amsterdam_walking_map.pdf
    • https://s3.amazonaws.com/veraxawewib/beloved_1998_full_movie_online_free.pdf
    • https://uploads.strikinglycdn.com/files/6495d7b5-a43a-4892-a645-ff2915ce33c1/can_you_program_a_garage_door_opener_to_open_a_gate.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_off0000f4ff.bin
6b60bea83056ea458532a0ad37796874ed67b8abee06fdcace48821991055201		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5540 bytes
font_01_sfnt_off000107f1.bin
30dd63d6e52617592ac55a2d8ff6bc45fcd39c444d846e0f4bfbca101929dbe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 11304 bytes

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