Malicious PDF — malware analysis report

Static analysis result for SHA-256 835c798ed0be1ee4…

MALICIOUS

PDF

92.8 KB Created: 2021-02-19 06:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1dd7d25e8c18af2a420bcc673f9687b SHA-1: 2cc46b4f20bdca37d39371901395d3101e0a424f SHA-256: 835c798ed0be1ee43eee3546acff0b4e4d28c9113b9b271b979ca9a1d257a413
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 0.9996

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://jottigo.ru/wix?keyword=biodiversity+worksheet+answers PDF link annotation
    • http://detonic-official.website/smart_board_projector_setupr8x4h.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/dF6Yij8/kik_application_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/eI4ZDOX/46490536637.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/ieYnidp/gunivexigixu.pdfIn PDF document text
    • http://cucoupon.info/nsfas_online_application_form_20186uawx.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/hjfJgdU/foderamexukakinodone.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/hi9uei6/12748769900.pdfIn PDF document text
    • http://fastgetme.online/expanded_noun_phrases_worksheets_ks2y67ca.pdfIn PDF document text
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/diraw.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/5619288.pdfIn PDF document text
    • http://pubguckazan.com/stickman_simulator_final_battle_mod_apk00eoi.pdfIn PDF document text
    • http://discount50.pro/hd_video_downloader_apk_free_download4uge6.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/GyPeia0/wokofibemor.pdfIn PDF document text
    • http://fuckfrsky.com/goxozejogevubixeunaa.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/FLihnIV/peluxopowi.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/vebogotexaf/30066776468.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/itunes_cho_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/lasabipogofokajewej.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_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 2976 bytes
SHA-256: 10e7b28edcd11f0ac2fff902dae9914ffe4449b7d2986a2cf5a26912164938ef
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 5248 bytes
SHA-256: 950b0206736b391a70e95691b091fd9725e81e7b3acd8820f5181d6e9c383d15
font_02_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 11752 bytes
SHA-256: a04c6106fa8ab84890f46f8c44785353ab3e33d9c4869c39ace0af239183ef8d
font_03_sfnt_off00014e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E88 16576 bytes
SHA-256: ffd98ab90598dfccf2d761e3ce198ea4a709c7b138c3138dc0b6e92fa7c48780

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