Malicious PDF — malware analysis report

Static analysis result for SHA-256 af38337c7a87e625…

MALICIOUS

PDF

85.3 KB Created: 2021-04-20 08:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca80630a2e2792cc3b419918f21a65c2 SHA-1: 7f7e03d81ef63d3d71b9e8fedf6705351236c0e0 SHA-256: af38337c7a87e6253eb2ed29a4e9d945c30398ed78d13e08bc39bcca6762b9bd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain 'jumiwimov.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=shoei+neotec+2+review
    • https://cdn-cms.f-static.net/uploads/4369922/normal_606ba6f56d964.pdf
    • https://static.s123-cdn-static.com/uploads/4454167/normal_60023c232a83b.pdf
    • http://naderuromopuru.22web.org/merano.pdf
    • https://ruwixotuso.weebly.com/uploads/1/3/4/1/134131383/8210692.pdf
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/jedosadoverutalonumu.pdf
    • https://cdn-cms.f-static.net/uploads/4464715/normal_603292e577c28.pdf
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/palurak_sofuxowoze_bikafowerivum.pdf
    • https://nobametu.weebly.com/uploads/1/3/2/7/132740930/kugudolojigaw_zoxut.pdf
    • https://static.s123-cdn-static.com/uploads/4388283/normal_5ff1cdd5d83c2.pdf
    • https://cdn-cms.f-static.net/uploads/4490266/normal_606e25d76ec63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/244d4ef2-d896-48a0-97c2-2274130ebcb9/how_to_clean_hp_officejet_6500_printhead.pdf
    • http://zomatiragi.rf.gd/model_3_performance_range_drop.pdf
    • https://s3.amazonaws.com/mawesenasijoser/fidiz.pdf
    • https://uploads.strikinglycdn.com/files/49be4cf9-ab3d-4057-a7fd-39de3b61e293/ways_of_the_world_a_brief_global_history.pdf
    • https://s3.amazonaws.com/fadupazageraf/zivilunumoxibere.pdf
    • https://s3.amazonaws.com/dazovosugev/investigation_representing_inverse_variation_functions_answer_key.pdf
    • https://s3.amazonaws.com/zunaporam/49481920908.pdf
    • https://uploads.strikinglycdn.com/files/81867539-e715-40bb-a2a6-e28e7ebb8a23/dunkin_donuts_mocha_swirl_syrup_ingredients.pdf
    • https://uploads.strikinglycdn.com/files/c8254286-fb62-4b7d-ba39-e244e0bb2d2d/what_us_food_products_are_made_in_china.pdf
    • https://s3.amazonaws.com/kukazowox/50366814953.pdf
    • http://sufelubunat.epizy.com/pasarodezegi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0b.bin
64327743e8f2e55d4109a70c09df064a0bc3bd9b0c89c8dd54e81a5d838aa9c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 4856 bytes
font_01_sfnt_off00010aa6.bin
cbf75d00f75fb62b969219efeff2a3cfab99c9bc6edd61e05d2e9792afe9e4f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 11360 bytes
font_02_sfnt_off00013143.bin
a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13143 16084 bytes

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