Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ac790cf4d573ed…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 19:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 28c890deaea1047035e0bf112f6bc111 SHA-1: 0c19f946f47b07aa77da5b894dd4f2517f58afe4 SHA-256: 16ac790cf4d573edb2c82e7eb4e42a7e2472c6fe1447091b15d89a7e23dfaea5
186 Risk Score

Malware Insights

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

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 0.9961

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/wix?keyword=scarlet+ibis+unit+activity+packet%252Fhogue%252F2005+key PDF link annotation
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/88d6dc442249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_604163c9a920b.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/Nhcgdjb/detect_internet_connection_android_studio.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/1652839.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/hegcwij/jelorenudowizepugufitefid.pdfIn PDF document text
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/3ad6274.pdfIn PDF document text
    • https://vevurufutugar.weebly.com/uploads/1/3/4/7/134737477/gedigazi-rovix-fuwek-tanapinunewif.pdfIn PDF document text
    • https://dagolitufewanat.weebly.com/uploads/1/3/5/3/135345669/04c4b1007d1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_601dc0932b9d6.pdfIn PDF document text
    • https://ratomewupevo.weebly.com/uploads/1/3/4/2/134234569/galoxifelexatavo.pdfIn PDF document text
    • https://resafuki.weebly.com/uploads/1/3/1/3/131398359/wuzasepesab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_603eb15e6026c.pdfIn PDF document text
    • https://balogidito.weebly.com/uploads/1/3/4/7/134726556/rufon.pdfIn PDF document text
    • https://lososegumupabi.weebly.com/uploads/1/3/1/4/131407698/vodoxejulenojeko.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/WhfE7JU/angry_plants_classic_mod_apk_2020.pdfIn PDF document text
    • https://gafojeted.weebly.com/uploads/1/3/1/4/131452963/3b0ad73e8fc327f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467300/normal_606287ea700d7.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/ganubifirigevi/16221285594.pdfIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_fe8c6a8d343b43df8fe9827266e67887.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_51abb12f64484a04a525e0877568fd9e.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_fbe29caf67184042be3e8a1342d44783.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legenapi/dafofimaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/what_do_the_warning_lights_on_my_dash_mean.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_037de80102234991bff9d6f52383bbb1.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_1919217f44eb40868fcd97e11ddd8881.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/arena_chess_program.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 6100 bytes
SHA-256: e00ff75a3dbfecbf9d5af91e0d4ba2a8c8dbf4635042b9256e4bdbc88d2e6796
font_01_sfnt_off00011561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 10860 bytes
SHA-256: caeee0798eeb8645679708f5c95b60aca204d062b07cc740ac027b55850715ba