Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a7b4ea9524eb06…

MALICIOUS

PDF

76.7 KB Created: 2021-05-07 14:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 15466b4a6a25321cccde9e385e6d7172 SHA-1: 11be5fc47e603e5a708da132c6266a8c2f88949d SHA-256: a2a7b4ea9524eb0602d560a9d858385ae79f093dddb00c6564dc973d48d7e63a
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 0.9991

Heuristics 6

  • 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 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://dafemum.ru/strik?utm_term=the+road+back+to+you+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411926/normal_6001b9402e2ed.pdfIn PDF document text
    • http://circleshtang.xyz/how_to_save_battery_in_fossil_smartwatchsutvf.pdfIn PDF document text
    • http://characduwe.space/toferopinavikl2dv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_603c732a7a41a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454681/normal_5fd7bea1b20b4.pdfIn PDF document text
    • http://dafesoxexigu.medianewsonline.com/56862597302.pdfIn PDF document text
    • http://ukranews.icu/drag_racing_bike_edition_apk_unlimited_money_indonesiaoag59.pdfIn PDF document text
    • https://rizimajapalikum.weebly.com/uploads/1/3/4/6/134633575/87c9d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_60029014d770f.pdfIn PDF document text
    • http://reduslimitalia-official.website/jurassic_world_survival_3_release_datea1lgf.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/pumamoxuxawodixejexuvifom5mb4.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/nekuwuxo-togupemimojejev.pdfIn PDF document text
    • https://vijizonumek.weebly.com/uploads/1/3/6/0/136034009/2677967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_6021ad7716e63.pdfIn PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/6876353.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/ef89a714-5071-4b4f-8591-f24fd380ad77/rudosetululo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa95656-4e35-485e-903a-c0ccd091db94/28164309682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25fb4b5-4c4d-484e-8e06-380451d4c5f6/how_do_i_track_dhl_global_mail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a5b2cc-3db6-44dd-9072-a7ee3c363bc1/40203056999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1b39f3-0e4f-4a03-b85c-907fabefb6b5/did_jake_kill_simon_in_one_of_us_is_lying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca3b35c-044c-4818-97d7-48a94e0c495d/contrato_de_arrendamiento_de_vivienda_gratis_en_word.pdfIn PDF document text
    • http://karokifewugasuz.onlinewebshop.net/possessivartikel_im_nominativ_und_akkusativ_bungen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15863878-b991-468d-8a40-dfe72aca4071/36992709220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e43980-22fb-4b1f-8e2c-a9ac01c28a2f/how_to_connect_my_garage_door_to_wifi.pdfIn PDF document text
    • http://xolevusafo.myartsonline.com/zololemawukoru.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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 5404 bytes
SHA-256: f2a6ac092a656d5dcc125ab957aff1b944a4daa326b67915d9602c06c9509f7c
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 10676 bytes
SHA-256: 98c5d991407482b8697cdff49533a661fa497d55494a031a5d00513964c5d8ef