Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9f3b4e30733585…

MALICIOUS

PDF

68.3 KB Created: 2021-03-28 14:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 49a9cc8e03b2075c33fd66fad059682a SHA-1: 6746a3f422a3e2110e0663ac524cdf287f55db8d SHA-256: cf9f3b4e30733585f75fad690b267a100b76d157e0610a9e8da4ecbb6a558d2d
186 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, with ClamAV detecting it as a phishing trojan. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially malicious sites. The document body, though partially corrupted, indicates a lure related to downloading 'Otanix mugen 2020'. The presence of external links and the overall structure strongly suggest a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://golowaki.ru/wix?keyword=otanix+mugen+2020+download PDF link annotation
    • http://jajolamuseku.medianewsonline.com/farewell_to_manzanar_chapter_12_and_13_summary.pdfIn PDF document text
    • https://wezifujizofuji.weebly.com/uploads/1/3/4/9/134904593/pevedumibafebuk.pdfIn PDF document text
    • https://dowogejur.weebly.com/uploads/1/3/5/9/135992185/rogetusetegaw.pdfIn PDF document text
    • https://lamuwibosuzo.weebly.com/uploads/1/3/1/0/131071033/lelevuvaluzu.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/dCXQ6PB/cod_grilled_recipe_food_network.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/jodopifowij.pdfIn PDF document text
    • https://munuliwakubife.weebly.com/uploads/1/3/1/6/131637312/4629676.pdfIn PDF document text
    • https://zatakigufexip.weebly.com/uploads/1/3/0/7/130738978/gisuwokuvego_tarutebixepino_madusud_sogutade.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/X5xK5hi/game_world_building_craft_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/Wiiamic/kexaku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1520a977-1b8e-4b62-9529-4a78df9b948a/rupipazux.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/skyrim_early_game_strategy.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_bb926372c63a47ff8499640d3bfb47dc.pdf?index=trueIn PDF document text
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_8b1f3d3047534b7ba70a81920b9a3dfa.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_b55cc160af0a4c2d85b20d4a7fb49726.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_c8829ee253d440b880dcdd0c10e7c397.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_af21801024c040408b28676634371258.pdf?index=trueIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_ce7b0c502ceb4a64a91da8a4bf506480.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_f689ca219c3e45fbbc637ea85d9caee3.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_6af7e5272911482aa4db85734f55998d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/692ac797-077b-4bf9-a587-5c04d9a2f74b/mupinalobe.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_a88be7dedb2247a08259fa02891ffbf1.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 5332 bytes
SHA-256: 062feb17f958f99683f4bc531e03c51e2a474f119dd1c9f98d1d79026ff9e715
font_01_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 9724 bytes
SHA-256: ec14bfbb96db2242d9cf7e419000fda395821f90dfa1e22517bf3cecd8013623

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