Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1b52560fe686e6…

MALICIOUS

PDF

86.8 KB Created: 2021-03-12 02:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ab635290914b00e8b81cd101ab4f24a5 SHA-1: cbe9c0cc7b6e73b9453c9ff526e1d3bc8353ea7e SHA-256: 6c1b52560fe686e66d5be430be8a779e7471380928383e97e2d8fe4673b9e548
186 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 ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the presence of numerous external URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vilenefex.ru/aws?utm_term=how+to+manufacture+a+lithium+ion+battery PDF link annotation
    • https://cdn.sqhk.co/rebabafa/hScxyv8/bopopogixi.pdfIn PDF document text
    • https://cdn.sqhk.co/garoresolif/mjbCgha/titan_quest_anniversary_edition_atlantis_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/icAVU7k/smash_bros_brawl_unlockables.pdfIn PDF document text
    • https://cdn.sqhk.co/naboxolat/icfaZZ7/dubulukudofinujunaku.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/jFxRge4/dinixatomuxo.pdfIn PDF document text
    • http://reduslim-buy.site/how_dangerous_can_high_blood_pressure_be2ektf.pdfIn PDF document text
    • http://sdl-trade.com/samsung_smart_tv_service_menu_advancedabjrj.pdfIn PDF document text
    • http://mangalvpodarok.ru/sears_washer_repair_partsrh09n.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/hTMgigh/zegevebasunenopolado.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/9gcFXdl/water_parks_in_ohio_with_hotels.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/HdidTzY/papamalisazuko.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/jahd2JC/allo_allo_season_1_episode_8.pdfIn PDF document text
    • http://kersita.fun/ragozaditeserufiselijfvlz7.pdfIn PDF document text
    • https://cdn.sqhk.co/dagorabowixu/gcgjggV/chip_challenge_game_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/4shijgF/tusugelugaso.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/cWTgcnv/global_warming_definition_kid_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ac1e0b3b-4f05-44b0-9d30-36f731181f8d/what_scooters_have_a_gy6.pdfIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_cef4319b30f84b3d80c4b3c4a69f02d4.pdf?index=trueIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_bf687dc298954b7991cdcd620e4acc3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e24cb78-dd55-45e7-86eb-4cda7e50c15d/carpentry_and_building_construction_2016_edition.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_a145d72b49b54280b2650257abc3df8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71baa3f1-aca3-4854-8374-745adf211a4c/funlux_camera_device_offline.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_3e2b9bedb1f247238ec8d9694685184a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/865e7451-fbbd-4b94-9770-850524f86783/what_does_code_e64_mean_on_a_frigidaire_dryer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 5120 bytes
SHA-256: 59d825c548567c69ea39f4e44944a531c6a4f9b5bfcb4a9af57ec7a71cecc54d
font_01_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 11152 bytes
SHA-256: 53aa50e0cef03ac58b3e41f9a4842b2c60ec8c977eab68a23773f56da558de77
font_02_sfnt_off00013f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F97 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f