Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a0cdda8d1f57b5…

MALICIOUS

PDF

77.4 KB Created: 2021-06-01 13:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a66ed2d31ccecdaac4348324d794388b SHA-1: 41c475de3cf016f415b3632a8cf7a0a2fa2a3db8 SHA-256: 04a0cdda8d1f57b5fcd095f284e2846ea3d40b5d2e702166d8ffcb918e28bb2f
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting a link farm or SEO spamming technique to drive traffic to potentially malicious sites. The embedded URL 'https://krisoc.ru/pbw?utm_term=how+do+you+calculate+the+weight+of+corrugated+sheets' appears to be the primary lure, disguised as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/pbw?utm_term=how+do+you+calculate+the+weight+of+corrugated+sheets
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/1453230.pdf
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/luzumoso-nabuvadulutovu-juruzupar-zorejom.pdf
    • https://vavetupabon.weebly.com/uploads/1/3/3/9/133999816/vojodisezobidid-tepusejifawed.pdf
    • https://rigokapine.weebly.com/uploads/1/3/4/5/134593974/garobewaxidexol-vodasa-mepawubakawimu.pdf
    • https://jakuxibakamu.weebly.com/uploads/1/3/1/4/131407414/989d08195.pdf
    • https://xekixaxaleza.weebly.com/uploads/1/3/2/6/132695200/5146589.pdf
    • https://gogafijunovox.weebly.com/uploads/1/3/4/3/134322332/6f60eaf21c37a.pdf
    • https://wotixefutakit.weebly.com/uploads/1/3/2/8/132815753/vidaxusil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kufujibumufa.pbworks.com/f/jandy_pool_heater_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/1fa5a8da-f1d7-469f-96ab-3579bf892895/modo_de_produccin_capitalismo_caractersticas.pdf
    • https://uploads.strikinglycdn.com/files/0ce06188-977b-4440-b8b5-f754b8beee54/1864473043.pdf
    • https://uploads.strikinglycdn.com/files/8f259a3c-d463-4354-83c9-8bd7fd4ba6b3/dirt_devil_vacuum_reviews.pdf
    • https://uploads.strikinglycdn.com/files/c9227b85-610b-48c4-967f-40536ae25e3d/mufibesomarunikag.pdf
    • https://uploads.strikinglycdn.com/files/85505f57-d5e0-4ab5-ba96-cbbd7f8b92b5/what_does_the_number_332_mean.pdf
    • http://nagomax.pbworks.com/w/file/fetch/144425670/bollywood_hd_mkv_avi_movie_download.pdf
    • https://uploads.strikinglycdn.com/files/edeedc52-8889-4ff2-926b-b0a274dcbf85/hp_1320_driver_win_10.pdf
    • https://uploads.strikinglycdn.com/files/5cb7e21f-4239-4140-94c0-e0cec7ed0dfe/luwikapuzege.pdf
    • http://mefijunov.pbworks.com/f/butevugose.pdf
    • https://uploads.strikinglycdn.com/files/59abea01-0a8c-46ff-8e30-35ee31ac7e4c/how_to_fix_samsung_plasma_tv_vertical_lines.pdf
    • https://uploads.strikinglycdn.com/files/c681caa2-453f-4253-be59-1d83da5ab5fa/pioneer_avic-z130bt_reset_button.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_off0000e3d5.bin
432af5c397f37f6275ec915d21279f412e0c90bbab0dff2104b5ad9285b335e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 5212 bytes
font_01_sfnt_off0000f5bf.bin
cc69684c02d6f1d36c1396d4eb00460bc0b0cb0233fd172d3a1754f510f98d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10460 bytes
font_02_sfnt_off000119a9.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 4324 bytes

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