Malicious PDF — malware analysis report

Static analysis result for SHA-256 612c78fc86e132e6…

MALICIOUS

PDF

86.4 KB Created: 2021-03-20 00:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 76fe34b368a3003ea280930c61fdf0fe SHA-1: bd90ca7c56282ac0515237b9e07e9d846af59cca SHA-256: 612c78fc86e132e61be974ad54355c8d7187cdcb5c5cac2cf3487bd0e07d6e0a
186 Risk Score

Malware Insights

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

The PDF file 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 distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://maypoin.ru/award?keyword=catalogo+price+shoes+urbano+oto%25C3%25B1o+invierno+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/xejudawadoni/jcPDgh3/mejubefudemobodir.pdfIn PDF document text
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/5641169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_6016c7268f6d7.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/cL8r3qU/cars_toons_mater_s_tall_tales_game.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/dc31f6dc27.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/gtCgjgJ/best_video_camera_for_social_media.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384632/normal_5febc0276a33b.pdfIn PDF document text
    • https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/ef9d7e11.pdfIn PDF document text
    • https://kobafadovuzek.weebly.com/uploads/1/3/4/3/134311208/bawofovivibaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_605274b1d9866.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/h5hcgiq/among_clues_for_among_us_how_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/NPjaCYF/muweperuxajofuvaje.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/TXhc0id/14571393766.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/5880781.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/wifebematikipe-kotatabudu-suludozapaxa-pevekoju.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/7577001.pdfIn PDF document text
    • https://cdn.sqhk.co/nomevagume/aFujHym/deroga.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/9453569.pdfIn PDF document text
    • https://babaxumo.weebly.com/uploads/1/3/4/3/134379683/lufumejuwiviju-nugowojokune-patesigowet-kadajejimu.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://s3.amazonaws.com/xugigabitulu/juvegaso.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/buffalo_lake_wa_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/large_sheets_of_foam_core_board.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/a_first_course_in_bayesian_statistical_methods_github.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 6008 bytes
SHA-256: 18a776ac79b52f835a5155d61522d05f3e131689be629ec9c1d1da8c5a09cf7c
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 12524 bytes
SHA-256: 5b924722440ba34bfaeabf1af64732fcecf505b5a645c75946878923393fb201
font_02_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 16140 bytes
SHA-256: 00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107
font_03_sfnt_off00013a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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