Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e518996e41d8fb2…

MALICIOUS

PDF

84.4 KB Created: 2021-03-06 17:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3de6a999ced1cb988e1dd3bb54213e5e SHA-1: 74df42df2428ec89e50bb838f4142bbb3d3e1b52 SHA-256: 5e518996e41d8fb2c016037225877aed1b9f96b363e24b032f45c2aab342cfe4
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous external links are indicative of a malicious workflow, potentially leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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://fokemale.ru/strik?utm_term=are+graco+and+titan+tips+interchangeable PDF link annotation
    • https://cdn.sqhk.co/lubometusoz/Jvicp8k/school_management_software_database_design.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/cgejcja/xodesazonudemomomubafir.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/ezjaihl/boulangerie_christophe_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/jfhfDIt/98626904694.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/Yggieje/snes9x_gx_vs_rx.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/2ghgfjh/cute_pokemon_hd_pics.pdfIn PDF document text
    • http://lukokiwo.iblogger.org/pimofikodipepal.pdfIn PDF document text
    • http://suboxobuwofum.iblogger.org/can_i_renew_my_id_at_a_dmv_kiosk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_dbce815bf46a4bfe80c16dc48c107d9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c2bed3-555a-4c74-8380-5088bf809197/boduwokogomibasam.pdfIn PDF document text
    • http://bopefurolo.rf.gd/berokoxuvubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec4af89-0d2e-499b-a81b-50a5142a1437/what_is_the_five_pillars_of_criminal_justice_system.pdfIn PDF document text
    • http://favukimasinete.rf.gd/cloudflare_1._1._1._1_android_pie.pdfIn PDF document text
    • http://lowazuxakosilal.epizy.com/bisivuvenizexokijaz.pdfIn PDF document text
    • http://marakolin.epizy.com/calculus_1_book_free.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_96ff6270225b468b9aa6fc519882e54f.pdf?index=trueIn PDF document text
    • http://bekovomojuto.epizy.com/scythia_civ_6_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 5464 bytes
SHA-256: 4808f7fa9d6c77be774ca2287dd247532e2371333b2be3bc7c851bd346deba0e
font_01_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 10560 bytes
SHA-256: f022501bb85819c9c99743c764bfd443baf8734d6669ee50f08e6b06b37de5d0

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