Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a71b33fdc4a601…

MALICIOUS

PDF

80.6 KB Created: 2021-04-26 19:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d0f8de173474fc26a745b49ffbf8da8 SHA-1: d5690ccb7dac016fbe6c5edd2a595b2dfcca1373 SHA-256: f5a71b33fdc4a60136b7ef987c820e554992d2ae57fcdbb2e2c26cba53b5146a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL pointing to a domain associated with phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=how+much+is+tactical+training
    • https://cdn-cms.f-static.net/uploads/4420927/normal_5fd2f0e4ba2ef.pdf
    • https://cdn.sqhk.co/semoxumid/oNX2hgg/sacred_games_2_ringtone_mp3.pdf
    • https://cdn-cms.f-static.net/uploads/4420431/normal_606c92980e23f.pdf
    • https://cdn.sqhk.co/dibirolinu/bEwqBtS/lovowegip.pdf
    • https://cdn.sqhk.co/zimalodepafo/gjFYhez/fist_of_fury_english_film.pdf
    • https://cdn.sqhk.co/jozojonujaj/gSwPgv6/citra_3ds_emulator_for_pc.pdf
    • https://cdn.sqhk.co/winogolelog/bVhcIuG/36317827013.pdf
    • http://juzajikadig.22web.org/weather_report_blythe_california.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lefumes.rf.gd/ccs_university_exam_form.pdf
    • http://gidetux.rf.gd/jivutekoz.pdf
    • https://uploads.strikinglycdn.com/files/a5fbd36d-dbb5-4c65-afcc-00464bbbafef/intex_2800_sand_filter_manual.pdf
    • https://uploads.strikinglycdn.com/files/b31dd942-48ce-48a1-8492-4054396b8746/how_to_test_car_battery_cca_with_multimeter.pdf
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_54fb9c2bba054efb8c8870bbb43c5ecf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6cb6c887-7ad7-4730-a745-cb3d0294c33e/lexus_rx_350_prices.pdf
    • https://uploads.strikinglycdn.com/files/31db8ddc-169f-467a-81a9-8d519c033819/budodazigebekifaluketijuj.pdf
    • https://uploads.strikinglycdn.com/files/c7c268ff-78f3-44dd-b552-20b90e6dd67c/autocad_jobs_houston.pdf
    • https://uploads.strikinglycdn.com/files/8f3ef58a-9af6-42c8-8a2b-70e67be4d986/what_are_trigger_words_in_communication.pdf
    • http://zujopafupo.epizy.com/61778296408.pdf
    • https://uploads.strikinglycdn.com/files/f30efcb2-0375-4a49-ba20-00c11af92e78/vezazowewe.pdf
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_8f24f967709740fb93473b45c2c2c8e0.pdf?index=true
    • http://tadufaz.rf.gd/rafazilakogojit.pdf
    • https://uploads.strikinglycdn.com/files/6da9983c-1c07-45a6-af3c-9c6b2160c1a0/modernist_cuisine_photos.pdf
    • https://uploads.strikinglycdn.com/files/8548fe75-3db2-421d-940f-6b4d6d9937da/movarazojowevoluxinipo.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_off0000f274.bin
1131b8c2307ff67847a291ecda075726545f9e8ce8aaf4870c0de6c009899c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5028 bytes
font_01_sfnt_off0001036b.bin
a28b6de722a0b91a99ee246d24fcdd96790d38e423dbc92f5e72e60a2c14c2ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 10240 bytes
font_02_sfnt_off00012640.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 4324 bytes

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