Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad16e1019a8a0ce6…

MALICIOUS

PDF

79.2 KB Created: 2021-03-29 19:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2bbb2782c972d6c2cebce866e3620792 SHA-1: dcd3a0590c4e1411e7f591987c035b8c0f372467 SHA-256: ad16e1019a8a0ce6c041e2ac1f8c3d610805f9ee27616e9184353b370610fbb6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed for phishing or malware distribution. One prominent URL, 'https://soxebez.ru/strik?utm_term=download+python+3.8.2+windows+64+bit', indicates a lure to download software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=download+python+3.8.2+windows+64+bit PDF link annotation
    • https://cdn.sqhk.co/suwajipufo/zFfIjbb/cash_app_money_flip_method.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_6038186414541.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/ifgcUih/72999411921.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fdd71015faa0.pdfIn PDF document text
    • https://cdn.sqhk.co/toledexipez/Hibjeha/tikutukogelasamugitosuzij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_605df9736efeb.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/hMgiCuf/zanujelofez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patotale/bottom_sheet_android_material_design.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_6ef07a6dd82f4b15bfc825e56d7284e4.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_d9f8edef6e484fbe91f2d153c0f87760.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_2922ae39a0ae4042ac4a10d81d27c6a6.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_b23850b2d41140088318522e7e703657.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_6f5326ff18ec48918a79655445b45a41.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_c9ec30ce4f4d416fa6e090644c836891.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/mechanics_of_machines_cleghorn_solutions.pdfIn PDF document text
    • https://f19d2187-ce67-4d04-8798-eef694565169.filesusr.com/ugd/bd4746_01adfbf791244d9ca53c75a5cfd8b68c.pdf?index=trueIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_6efd24d7147a48828a686a593156284a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/29275667432.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_964773bb0ae14d20a2f308b4117af2a7.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_e3856718198d48928b1248099fd02fcd.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_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 6048 bytes
SHA-256: d0bc055a7e30a529ac0736d72a1d9d7ef966c3c482fa7088c4ab0ca113a41903
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 10932 bytes
SHA-256: 7bd2f54be6717b3b5caab5ac0c4e5851565a0af4338627efe3d0c9530b69dc32