Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6fbe1c0741ea2f…

MALICIOUS

PDF

87.6 KB Created: 2021-04-14 08:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 50fa486fc099c4aa9c9506e61578b9b4 SHA-1: 75d2126ffc76246cee7248b6acedcc5f1c73a779 SHA-256: 3a6fbe1c0741ea2f493934cd2fc59f6e9c7b275caae3115c3f8fb1e0e86bc3fb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://baarspo.ru/strik?utm_term=pete+the+cat+rocking+in+my+school+shoes+song+youtube PDF link annotation
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/risusolowu-pekek-rikuzeni.pdfIn PDF document text
    • https://tefewijinoxo.weebly.com/uploads/1/3/4/8/134881123/34f6bf6cdd72.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/Mjbgfhf/ninetisakukopisalodekupo.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuzivo/yIbgggd/best_claw_machine_arcade_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/turovonunido/btAjije/rei_s_minimap_mod_1._12_2.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/3af43e243105.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/6QHdnVG/stumble_inn_derry.pdfIn PDF document text
    • http://pigovaze.iblogger.org/lobamokafu.pdfIn PDF document text
    • https://cdn.sqhk.co/boxoveru/gdjgjja/mystic_messenger_zen_route_day_8_phone_call.pdfIn PDF document text
    • https://bujakisuka.weebly.com/uploads/1/3/2/6/132695398/merak-wiben-kotojiki-nejadatem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae36038-9c08-4b13-b379-6e90d340c1b3/how_to_prime_a_everbilt_shallow_well_jet_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4347c9ae-b64c-4c1a-a6d3-23513285948e/wedur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c7ca362-4976-47c9-a2ba-614e04a26ed2/how_to_program_genie_remote_to_genie_box.pdfIn PDF document text
    • http://maxusopexezevob.epizy.com/columbus_blue_jackets_schedule_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68113e71-9e58-4e70-8825-38d20da3572e/2528295826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b520280-7bcd-487d-b764-6c2390c29f17/winegard_carryout_g2_installation_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5d7833-ac49-41b2-baea-d9ae77d875dc/army_rifle_qualification_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41c3c22-02f6-4e0e-bb30-1fdcb4e4a8e2/3811679139.pdfIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_8b6e72f9288745fd98167a637bd7ffb5.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_383b081b804c478eb0b94c6a74a6b914.pdf?index=trueIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_375be0ae9f4d486684632caed58d5ef6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff6cd5a-4fec-4fad-97ba-a7ec274ec317/84818593391.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 5520 bytes
SHA-256: defe11e7871e3b514327d4f350aac2812d4504840781a43651788f91d970995c
font_01_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 12132 bytes
SHA-256: 2d5e453394dd22bccea128a6575c63f20d8ff44d95a9e92f6449ecf59dac917a
font_02_sfnt_off00013cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB6 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb