Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b5831c053f799b…

MALICIOUS

PDF

87.0 KB Created: 2021-03-19 04:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6131a555f54e782428176df55c7d5ea3 SHA-1: 88a2c62de368cda5606baaac154db4194772ce75 SHA-256: 33b5831c053f799be1b598cc45e75f45c89f4a29aa89c7b3762245a637cd8a5d
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of embedded URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://xezojetit.ru/strik?utm_term=tuesday+with+morrie+movie+quotes
    • http://refoxipixob.iblogger.org/rarunibagiwevigale.pdf
    • https://cdn-cms.f-static.net/uploads/4378623/normal_601006379952c.pdf
    • https://cdn.sqhk.co/sisadenev/Ohhhajc/25600064430.pdf
    • https://cdn-cms.f-static.net/uploads/4417809/normal_60405369cd07f.pdf
    • https://cdn.sqhk.co/suxavawudomo/wij7hc4/racing_games_2d_online.pdf
    • https://cdn.sqhk.co/rifusofuwedi/ididigf/how_to_play_among_us_on_computer_controls.pdf
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fdf391c3f8b6.pdf
    • https://cdn-cms.f-static.net/uploads/4415530/normal_601d5d62f2bf5.pdf
    • http://zibanozoxepezu.iblogger.org/memute.pdf
    • https://cdn.sqhk.co/mizogujuzo/gXjdAig/infectious_mononucleosis_test_price.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zulojivikedeg.epizy.com/59841347944.pdf
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_9f8bbee1a3114ecf8827042e383dd360.pdf?index=true
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_0411185657024c4fb3af5ca8bfa756ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fe45d4f0-ef47-46ed-bb2f-4fadeca42482/29093942586.pdf
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_058161fe2dad4b47a6f06145631e3c77.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f40f0565-7144-45d0-a0a2-18a2408c2583/dark_souls_2_scholar_of_the_first_sin_ps3_cheats.pdf
    • https://uploads.strikinglycdn.com/files/5a86d893-d093-4cc0-8aed-de55ba65d215/first_alert_model_p1210_deactivate.pdf
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_f3dc6b3f43e44ab088141c661b71793c.pdf?index=true
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_bfa6c6ea5843434090aa53f0a47d5b5d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/492a4a97-e125-4c56-b5c8-a34dddb6b2cf/gospel_of_peter_resurrection.pdf
    • http://zulexesovo.epizy.com/masters_in_business_information_technology_usa.pdf
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_ed74699fed24434596f652b5a250dd04.pdf?index=true
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_a2a94c787a27426e8f8648358e4629a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/560f4ca5-0482-4c6f-a457-bea5ce5c6c0d/what_is_political_theory_and_its_significance.pdf
    • http://tumevuton.rf.gd/filavanov.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_beb92e0bd3aa41609f993568fe9b899f.pdf?index=true
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_6168dd9b7fc54276bc16f60e413cf51b.pdf?index=true
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_6684e95957f5455f9680a8e2ac441668.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106f3.bin
2368af658e80f23d6652da7057903b3a5f99f6c422fcf7355470f268a3f58db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 5140 bytes
font_01_sfnt_off00011884.bin
0cb3ba8cbfe1d984bf0ba18845832cf31fc2c818ef9401b3a265195700b92287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 11868 bytes
font_02_sfnt_off00013fee.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEE 4324 bytes

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