Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6caf1dac5c19bb2…

MALICIOUS

PDF

88.1 KB Created: 2021-03-26 10:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a04231cb60814acffafa799f0298e87 SHA-1: 2f3c263991df0e16c06c7665c3c27971d1aa441a SHA-256: b6caf1dac5c19bb270bab5cb85011cba5441ef28c315cebd237ea6ba0bb61e56
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The primary embedded URL is https://vilenefex.ru/wix?keyword=ark+master+zoologist+trophy+guide, which likely serves as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/wix?keyword=ark+master+zoologist+trophy+guide
    • http://pagavopalubutu.scienceontheweb.net/68654730540.pdf
    • http://funseeds.site/how_to_turn_on_sub_zero_ice_maker79sim.pdf
    • https://kovepezerolozu.weebly.com/uploads/1/3/1/4/131483153/5a0941180e98.pdf
    • http://radanews.site/14275026733ndgls.pdf
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/ximapisisikij-fakabawenizu-dogalenem.pdf
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/wovasurazidus.pdf
    • https://cdn-cms.f-static.net/uploads/4454813/normal_602d603b65276.pdf
    • https://cdn-cms.f-static.net/uploads/4412592/normal_60421c510d5d6.pdf
    • http://dorulezebum.sportsontheweb.net/decrease_file_size_adobe_reader_online.pdf
    • https://tiwamufeg.weebly.com/uploads/1/3/1/8/131871705/wotawuruvobaxe.pdf
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/sexusumudep.pdf
    • http://decideyouself.fun/97944277868kpglw.pdf
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/tonumorizijuw.pdf
    • https://buputulu.weebly.com/uploads/1/3/0/7/130738697/1c9e3.pdf
    • http://mantenancie.com/cmw500_nb_iot_user_manualymzht.pdf
    • http://janafan.scienceontheweb.net/cambiar_de_a_word_gratis_online.pdf
    • https://cdn-cms.f-static.net/uploads/4449419/normal_602ab94bd1a7b.pdf
    • http://pazifelurup.medianewsonline.com/pearson_edexcel_igcse_9-1_chemistry_textbook_answers.pdf
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/tuvosorubaze.pdf
    • http://brandframeb.com/bahubali_movie_hd_songs28dn3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c177754b-c930-4d03-95cc-988b1612ace4/how_to_draw_for_childrens_books.pdf
    • http://revudipepofaten.myartsonline.com/b_tree_insertion_example.pdf
    • https://uploads.strikinglycdn.com/files/d075220c-f79f-424c-810e-3ee75ee8cd5b/how_to_rune_magic.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_off00011bd6.bin
664ae3483c8bcaf11406b23968256b578b577ed47335277230df62fb62f3691d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 5580 bytes
font_01_sfnt_off00012eb2.bin
0d12e07363a47282f7669b72f9bc95f576123d6dc9f3e90cebf729b10a08c187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 10516 bytes

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