Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b0b2fd34995288…

MALICIOUS

PDF

81.7 KB Created: 2021-04-01 16:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 220604392e4542f49c08f8d746bc779f SHA-1: 2534c8207c916632609852cf14d66f7a114af783 SHA-256: f2b0b2fd3499528804efbc412c827e2624bccfdb34417720b3442ded50249fef
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm. The document body, though heavily obfuscated, suggests a lure related to 'how to change filter on holmes air purifier' to encourage clicks. The primary malicious URLs identified are seumenha.ru and fastpysystem.online, which are likely used to host or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+to+change+filter+on+holmes+air+purifier
    • http://fastpysystem.online/624243103782wg6r.pdf
    • https://cdn.sqhk.co/vekuperik/7pJ0jaM/ice_matchups_pokemon.pdf
    • http://everydayy.fun/farmall_hats_shirtsq3ogz.pdf
    • https://cdn.sqhk.co/zatovafer/dMIUw3R/fear_in_hospital_survival_apk.pdf
    • https://cdn.sqhk.co/febowozefu/jihd5I2/heroic_period_meaning_in_tamil.pdf
    • https://cdn.sqhk.co/zibepidok/Bjuuehh/gisofinigedubopidonoruw.pdf
    • https://cdn.sqhk.co/mesojofu/dgfTsFc/45056343568.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_4366654f88a8487094d2148af2f9f47c.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_2054a140b5444b0d97257ddfd6960b22.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_c327155edea1409e9d75c2ec2917e165.pdf?index=true
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_e1440cd2900f44bfa1a9d497b59765ac.pdf?index=true
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_1a75110091c0488882f4a27ba06715fe.pdf?index=true
    • https://d692b82a-d563-45ba-818c-0512d98079dc.filesusr.com/ugd/1c7397_5432f78d1003450f8bff457c6f2485c2.pdf?index=true
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_9048772179914b06b65845e19a1ebe38.pdf?index=true
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_0e68efc2042846ccbd89b08cb46a14d2.pdf?index=true
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_399e1fd5281d4226986454e77562fa08.pdf?index=true
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_2e25f4d6067b4712bd3899865f9969a1.pdf?index=true
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_6ccca39558c04d8084a9906fd734c83b.pdf?index=true
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_58b3e3c5a29647d79ac1b7443f023007.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_off0000f3f6.bin
9f73f96ca42608c4985998b3733541acb8905f1b1e02920423248071de3bf926		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 5364 bytes
font_01_sfnt_off00010618.bin
d3ee9a2012de151f7458f1aebf4c3f72cca9516e1d18f555bc5444dd7eb245f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 10924 bytes
font_02_sfnt_off00012b3a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 4324 bytes

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