Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef68f60b3ad096c4…

MALICIOUS

PDF

90.1 KB Created: 2021-04-07 23:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 546760a8dd21e212de099f97639d2720 SHA-1: 1ec40b3107bf350f4caff770f5e1939b18fcfb6f SHA-256: ef68f60b3ad096c48127b80a73768e5ffb06438f579940face6d301b5b63ea96
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and is structured as a link farm. The document body, though heavily obfuscated, suggests a lure for a game download, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jumiwimov.ru/wix?keyword=super+flash+mario+bros+game+free+download
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5ff66e8ced222.pdf
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5ffb5b50a43da.pdf
    • http://daating19.site/candy_crush_for_pc_free72h7f.pdf
    • https://cdn.sqhk.co/defisepeniba/igchcgd/download_alan_walker_piano_tiles_dj_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4450417/normal_604ccf9c8cd9b.pdf
    • http://copyrightshelpscenters.com/57258174173slqc8.pdf
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5fe720de15974.pdf
    • http://yachts-4-sale.com/risc-_v_instruction_set_cheat_sheetyf5by.pdf
    • https://cdn.sqhk.co/zaliroded/NjafAja/game_talking_tom_jetski_2_mod_apk.pdf
    • http://perfectiona.online/rci_2950_dx_mods86ehm.pdf
    • http://okclub.org/ross_carbonite_ultra_firmwarezfgqs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0e20db38-560d-4c13-a3ae-93dd4026b113/philosophy_of_science_the_central_issues_2nd_edition.pdf
    • https://s3.amazonaws.com/dusubonifu/polygenic_traits_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/2bd2c872-2c5d-4343-9c3f-e70810b9b9a8/what_is_the_best_blender_food_processor_combo.pdf
    • https://s3.amazonaws.com/zafibimutadoti/fewuxinuripurewopag.pdf
    • https://s3.amazonaws.com/bulolimepol/bufelifibikogaba.pdf
    • https://uploads.strikinglycdn.com/files/0ddeba83-4076-453a-89b1-ddba70851652/basic_probability_worksheet_with_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011499.bin
9f3161b4c8353fd6910a33a67e28143d8b899c3e78f6c110393e05905699fe46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 5592 bytes
font_01_sfnt_off00012776.bin
cc612942a3acf59b10b51cb877c9b8a4b5de784bf304e1362361d06a522badfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 10960 bytes
font_02_sfnt_off00014caa.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAA 4324 bytes

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