Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb163292356de346…

MALICIOUS

PDF

77.6 KB Created: 2021-03-06 23:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a0d4191f73537c4714af5d587429f39c SHA-1: 16cc3806e184a32630360f9afa0bc5f1fcfa1a3f SHA-256: fb163292356de3460dca4ed13721ecdd73d5ff87975c80b8aa14aa9d9de6bd7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=how+to+use+russian+accent PDF link annotation
    • http://zopokujejisolan.getenjoyment.net/how_to_fix_the_sound_on_my_element_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/dhgQjgR/68249467396.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Ovlrkhd/equalizer_program_for_windows_8.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/heswkjg/15315950686.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/xasenozusufom.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/7249954223.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/zefikoxiw.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/5762922147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_0302887c77fc4eeca2a7b2cf346ced01.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_ebd2728af14247258c4e62e933bcb7dc.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_30cb44ecc7b048e5852c15093875b723.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_49bc0bc0e1d64c2981794e428448a962.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/transformer_voltage_turns_ratio_calculator.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/ramemejufolubix.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_1bdbfe472fab4a5683f72c14e504f6a7.pdf?index=trueIn PDF document text
    • http://sajulugebimisu.myartsonline.com/sizisivegomojisutifufiwuw.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_38dfeccbdaed47258d704570e9345457.pdf?index=trueIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/pigukewoxetudisosoxisima.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_b5a98fc897ae48cf833313903ad65091.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/66598601422.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_3ebbac3d5d0347dca2d976593ba1e545.pdf?index=trueIn PDF document text
    • http://paguxesij.myartsonline.com/1275498164.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_b7836b7f86b14f1bb62fdcc867f7cb05.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_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 4812 bytes
SHA-256: 626e4b8fdf21033e4870bdb8de3751710ef6c8615cac6f26b1088bceb611209e
font_01_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 11296 bytes
SHA-256: 7bdb3af3d4db50c6831a1473ebd7f907606876038cd7a01f6df33d675a2ce4f5

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