Malicious PDF — malware analysis report

Static analysis result for SHA-256 840745be811b3f8f…

MALICIOUS

PDF

76.5 KB Created: 2021-03-26 07:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1e74bd67ce0015bbe98231cf2c1c3c2 SHA-1: 7a0f826b45f2d26ef12d60a89dfd9bea682caff3 SHA-256: 840745be811b3f8fff055ad33de1403a24afda2ebfe3b97feb1540a4cec06372
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and contains a download button lure. The embedded URL points to a domain associated with phishing, suggesting the document's purpose is to trick users into downloading further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=amway+business+plan+presentation+pdf
    • http://degifutuv.scienceontheweb.net/akuntansi_sebagai_sistem_informasi.pdf
    • http://usacreditcheck.info/32821133599e1dtm.pdf
    • http://gosepakaf.getenjoyment.net/64594272907.pdf
    • https://cdn.sqhk.co/pipidopowewe/jxdvhDG/99811440328.pdf
    • https://cdn.sqhk.co/mapetidul/bb8Cjg6/rubodafumasere.pdf
    • http://cesaregaspari.com/infamous_second_son_first_light_trophy_guidesuh0z.pdf
    • http://forajadafogaxuv.medianewsonline.com/how_many_episodes_are_there_of_defending_jacob_on_apple_tv.pdf
    • http://tajupodibo.iblogger.org/kepelbagaian_agama_di_malaysia.pdf
    • http://my-credit.info/bcbs_ma_claim_formc84l0.pdf
    • https://cdn.sqhk.co/dafisuwikib/7jcjbfx/pirazulukizadonuvezekewor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_98e6d64c0f9f46b2bece1d50bc9fc7e8.pdf?index=true
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_f79d64c886c040899233fa93029372cc.pdf?index=true
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_d405ae49dec745baae9e77ea231b4c90.pdf?index=true
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_0bda7b11adf84b50aa68f007a9c5b67b.pdf?index=true
    • http://rafobubavotiba.epizy.com/powerpoint_templates_envato.pdf
    • http://kukalofawofami.epizy.com/how_to_iso_9001_certification.pdf
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_ef883128eb944e208e5588afdbcec343.pdf?index=true
    • http://nanesipub.rf.gd/32171607399.pdf
    • http://gagolabirej.atwebpages.com/63471185547.pdf
    • http://mojozore.myartsonline.com/lavebiwitun.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_off0000e96e.bin
354151bea7f9fc20c7d79eeb91ea220d067554c45094b2d05464c20ebb5b4fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 5508 bytes
font_01_sfnt_off0000fc20.bin
6523a150d1d40f2679e1cb813990937461c5b8f21211b6561ed1f6dbcbdd79ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 12028 bytes

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