Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bb6bdf3a2301d8…

MALICIOUS

PDF

84.7 KB Created: 2021-04-04 01:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6cf6d79242856cea2bad0e2d2abcb397 SHA-1: ca3ffd469c399dcacd31ad031afd535c760d5075 SHA-256: a5bb6bdf3a2301d846045c1ab5a1277af61a3af18bde2c95704b0188a9f9b0ec
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://soxebez.ru/wix?keyword=forge+of+empires+cheats+no+survey PDF link annotation
    • https://cdn.sqhk.co/rotogogoji/ghgdjb1/45893197649.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/OJjbif2/retro_nes_emulator.pdfIn PDF document text
    • https://tavasosezirom.weebly.com/uploads/1/3/4/7/134768566/disufotolim-doruxomurega.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/1jjd41G/kajoxizuv.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/dowajugi.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/dab7442234.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/gQB5b4l/chat_translator_mod_minecraft.pdfIn PDF document text
    • https://nugatifijomit.weebly.com/uploads/1/3/4/7/134715362/dexawovuvejawe.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/xicugfb/hobby_lobby_coupon_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/yiivOtj/police_siren_simulator_online.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/6756556.pdfIn PDF document text
    • https://cdn.sqhk.co/lalivaga/MyijRij/brothers_in_arms_3_hack_version_download.pdfIn PDF document text
    • https://zepofujokedab.weebly.com/uploads/1/3/5/3/135315754/5117787.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/bupumilozafi.pdfIn PDF document text
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/xafepijureruni.pdfIn PDF document text
    • https://fototinuvanumef.weebly.com/uploads/1/3/1/4/131406749/3842449.pdfIn PDF document text
    • https://vumamoxaku.weebly.com/uploads/1/3/1/3/131380777/a0521ad.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/popafuxapuviwizi.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/3424eee2.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/kr91f1C/pabekejafilakobezi.pdfIn PDF document text
    • https://cdn.sqhk.co/xekawiba/dis4jfM/leapfrog_game_system_for_sale.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/3438190.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/29434c90-4b5c-41b0-a7ba-35268ae789ba/ladizekixiwusekigomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d929e0c0-c4f9-44c5-b24a-0669a9565bc0/save_the_cat_beat_sheet_movie_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c9d59f-cdbe-41cd-be27-a079e6f44b3d/kali_linux_raspberry_pi_3_b_installieren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc844e4-41a7-4aa6-9f10-ed76b5f08f84/medieval_2_total_war_game_of_thrones_mod_crash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c95c7f-c3dc-4f01-ac04-98edd7bce026/13544883682.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_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 5512 bytes
SHA-256: 8381f3e02d325b5a093d1d1a7dd77edb891429dee9233f318a0031e032e8bd7d
font_01_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 2332 bytes
SHA-256: 682d6366fa9e31af77a1f805a044c3d34543b8b7e5f739e44ce9fdcf88f22cfe
font_02_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 10832 bytes
SHA-256: a5e953f355a248d7b87fa945182069157e74244381aad62d98982db3599a011b