Malicious PDF — malware analysis report

Static analysis result for SHA-256 11783197079a4a71…

MALICIOUS

PDF

80.6 KB Created: 2021-05-07 21:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f3647d800a9fcf9cfa95a6e3b8519ef3 SHA-1: c0ae3990737941f4fb2c4f63674876f2b4d9ee83 SHA-256: 11783197079a4a71a32232ca8aad7c9ea8e36eadfa98398870c02b50c88d23b1
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 hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=dymo+letratag+not+printing+top+half PDF link annotation
    • https://cdn.sqhk.co/bugolajoxodu/idijjaF/sword_art_online_wallpaper_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_605f70ee70b75.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/higfhes/49698479685.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/heifgjv/mebafovopuvubuva.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/nonegulipup-bekoxa-rokut-tiduwedorot.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/hEOhduC/rotator_cuff_tendonitis_surgery_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/iHVxsQV/car_driving_game_download_for_pc_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_6035188902a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_603b0c8aac5ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417992/normal_5fd07265ab524.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/5s0tGH6/suxob.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/RXXUGSH/paxilapotofixajafo.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/kodufaroxetibez.pdfIn PDF document text
    • https://bufasadapigeze.weebly.com/uploads/1/3/4/3/134307931/f9ec14eccb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/zenonia_5_weapon_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca9ac08-0720-4193-97bc-8d09883ee8ef/history_of_3d_animation_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/incredible_5_point_scale_printable_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b47207-1985-4a94-abd4-78d3f18a57b5/robot_coupe_r2_dice_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d9af55-b6c2-4f6e-8905-2d88f8acd7a4/72496498182.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/jidebu.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/scripps_spelling_bee_school_pronouncer_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee81d4e-318b-4781-9965-e836d717e72a/19149651851.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/never_alone_barlow_girl_sheet_music.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_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 5236 bytes
SHA-256: ea542198401193bb108ba49cf359b692edb03cbc780635bdeb37ac4c29c70520
font_01_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 10872 bytes
SHA-256: 76383696ae881448d16163b911207cf940c5adecd9bb48692cdf202247d4beeb