Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c853fc2967a50cd…

MALICIOUS

PDF

97.4 KB Created: 2021-06-05 03:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7abc2af4281f50d30c0f852ffd1651b5 SHA-1: 4e1dab7a1d6d3f414496a6a296b7a91d1feb6bde SHA-256: 8c853fc2967a50cd444d986ebbb88fcab029f9e0253f78b112bc6f02cc0abf58
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://ketchas.ru/pbw?utm_term=stanley+fatmax+powerit+1000a+problems
    • https://fujokemile.weebly.com/uploads/1/3/4/6/134694414/rukupalekitekikulo.pdf
    • https://zobupevebidibet.weebly.com/uploads/1/3/3/9/133997179/kebofotinevudo_gezadoxar_vowopigetisedul.pdf
    • https://cdn-cms.f-static.net/uploads/4459468/normal_6021948daca22.pdf
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/063c825b710e2bd.pdf
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/lefobaveluk-vemifuri-lagoxesaxefipam-vokavoja.pdf
    • https://cdn-cms.f-static.net/uploads/4413345/normal_601d22e9d59bf.pdf
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/cf034c.pdf
    • https://cdn-cms.f-static.net/uploads/4427501/normal_6048dd2a10bed.pdf
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5fe154e1dc12e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mulasamesi.pbworks.com/w/file/fetch/144617361/acs_study_guide_for_organic_chemistry.pdf
    • http://mikabipi.pbworks.com/f/56052181586.pdf
    • https://uploads.strikinglycdn.com/files/19b8a27b-b8fd-453c-a197-116a2e8ff75b/79632120599.pdf
    • http://fudejob.pbworks.com/w/file/fetch/144577089/real_debrid_how_to_select_multiple_link_automatically.pdf
    • http://xuwedateredu.pbworks.com/f/lenegazowasovanuvob.pdf
    • https://uploads.strikinglycdn.com/files/c9b810a0-87dc-42dd-aa13-405acb6a60b5/pabik.pdf
    • http://rixepal.pbworks.com/w/file/fetch/144636558/buxep.pdf
    • http://mizunebapod.pbworks.com/f/97024492461.pdf
    • https://uploads.strikinglycdn.com/files/1662b7b5-1f7e-4010-a972-6fdb0aa3ba00/73123930862.pdf
    • http://funinupun.pbworks.com/f/bertelsmann_foundation_transformation_index_2018.pdf
    • https://uploads.strikinglycdn.com/files/17985295-3b99-4e6f-90be-a12e0fe20379/68183456384.pdf
    • https://uploads.strikinglycdn.com/files/d9ca9ac2-cdb4-4b14-9b22-dd8c76c6b0a3/verbos_en_pasado_participio_en_ingles_irregulares_y_regulares.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_off00012673.bin
094b43e0a74db1e65297ee1a2a12b677efab2365ba77008f2bed8443ea1bc559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 5744 bytes
font_01_sfnt_off00013a0c.bin
a82782e27a325495a23ba8b5c29885a718ccdf3eddd34b33a3347165c23803b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0C 11552 bytes
font_02_sfnt_off00016163.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16163 16092 bytes

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