Malicious PDF — malware analysis report

Static analysis result for SHA-256 839e9c1d670d0d63…

MALICIOUS

PDF

87.7 KB Created: 2021-04-27 04:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d7943b6c78162bc215a647b780c87f SHA-1: 73eeb878a6733c5e7dfd2214f533306cc94fb7b4 SHA-256: 839e9c1d670d0d63898e83306edced7d2fbcbc96a73de8ee34fe033aebe3ef4e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to software downloads, aligning with a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=adobe+premiere+pro+cs3+tutorial+videos+free+download
    • https://cdn.sqhk.co/tuxogafu/zRXgdhb/lemudexatefoxopenosemam.pdf
    • http://the-job.ru/audiosurf_music_downloadf3l0m.pdf
    • http://fastcreditreport.info/42270478874ugqls.pdf
    • http://kejoxemubogese.mywebcommunity.org/37036787165.pdf
    • https://cdn.sqhk.co/gujurolekuma/pHcgihf/darkness_and_flame_2_walkthrough_8.pdf
    • https://cdn.sqhk.co/tatogevi/djfTjeu/99050556684.pdf
    • http://fobativ.mywebcommunity.org/amnagement_du_territoire_et_urbanisme.pdf
    • https://cdn.sqhk.co/xubupigegi/jjhfuwi/63841431504.pdf
    • http://mosebuzixat.mywebcommunity.org/amazing_fantasy_15_value_american_pickers.pdf
    • https://cdn.sqhk.co/dawajimet/1iiznrw/fezununadinofaguxezek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d345072-715e-4c6e-9518-09d32bc2f296/cape_cod_5_bank_routing_number.pdf
    • https://uploads.strikinglycdn.com/files/7c1043ce-b7a4-4ec1-af5b-1a0acc00612c/82148956712.pdf
    • https://uploads.strikinglycdn.com/files/8b6559ff-e328-43cc-a998-e28b37c381de/45815636999.pdf
    • https://uploads.strikinglycdn.com/files/268310f6-17e9-4d43-b29c-d53b60da37a4/free_printable_daily_weight_loss_chart.pdf
    • http://kavibajegis.onlinewebshop.net/tijazelisiramibegudolab.pdf
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_59014ce57a7a4a779065462bb4f8ae15.pdf?index=true
    • https://300a1258-3b13-45f7-80b9-bd8966f45320.filesusr.com/ugd/81888a_d3e6144e59944f1ab689c1c9b021023a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b395e7e2-6c05-4258-a595-5784e2dd4638/att_velocity_prepaid_mobile_hotspot.pdf
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_6d9c5c5ddc5148439120135364a95356.pdf?index=true
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_169ceeda788748f28e1630ca52f3f8e2.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001150a.bin
70412883309e3bbec68965eb3e292f94d09c1e083b4f1ebb0c969a503a3235a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 5744 bytes
font_01_sfnt_off00012892.bin
5c26a81c6dad204d8d01fd73a5b31ce3959ec58356f63bbea4a1236d583dc01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 11408 bytes

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