Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8402c0db25301f5…

MALICIOUS

PDF

89.5 KB Created: 2021-05-21 06:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 284908b695b26de7474425f2f708de99 SHA-1: 5460e7ddb3e8b0e828a11169704b0f25a05b87f4 SHA-256: b8402c0db25301f53dac673a7060c81278d0fc780c0cf8cd358db471b5fd70bb
206 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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of PRC/3D content and the overall structure point towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://druttle.ru/strik?utm_term=msds+cmc+sodium+carboxymethyl+cellulose PDF link annotation
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/wonabujanufed.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/japosusinegam-zeturofenukopir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_6041f101893ef.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/sudoxezag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_6066a2912e458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_60651c1935c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_605c705dd7b1f.pdfIn PDF document text
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/3857dcbd6d.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/1937547.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/gonokexojiborojidu.pdfIn PDF document text
    • https://beteviduzil.weebly.com/uploads/1/3/3/9/133986260/abe572c86a41a.pdfIn PDF document text
    • https://terogoke.weebly.com/uploads/1/3/4/5/134587715/gevibeji-xofikuziz-nofupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/formule_jeune_auberge_de_l_ill_illhaeusern.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/63067152424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ac419a-6356-47b7-9666-cbeead686362/45269951410.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/free_wood_shooting_bench_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc781275-9181-474b-975f-c1a540c141ac/the_walking_dead_comics_deutsch_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f06af67-8824-4425-ae22-35a0d1bf33cc/how_to_apply_for_food_vendor_license_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea058bd1-4ac1-4e29-8880-4625ccc3c9b3/what_do_internal_auditors_look_for.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/wowhead_leatherworking_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716efaed-f720-4f1f-b16e-a6cbc7a0f3fc/fuxabesagenobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bfbcbd-16cc-4d30-ae68-75a7d1fba97e/gozadobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936ae253-8001-4e68-a927-cd12e1a514be/bisarovasenemowugopobe.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 5268 bytes
SHA-256: eb6a1c79e2f7d008b6a80569bf141f1226debbd0bb229db58463aa71ec919e2d
font_01_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 11168 bytes
SHA-256: 9cba8dead72e4c51257638ac7b1ea21ab26359b9c2f6c03e3ff36ac9383974e9
font_02_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 16260 bytes
SHA-256: 16d3f8655114d0902318f1a45715520560773d3bf5e390d74f207be828cb3ad7
font_03_sfnt_off000149b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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