Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf825bf0167d41e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-18 02:33:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3c11c85da7f331d4be4991336902efb0 SHA-1: 5b2533cc79d834c39ffe1a546ba1dfa88f0df47b SHA-256: fcf825bf0167d41e12b747e4722655edb5696cac9f11f20e08fe0bd00b870097
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 0.9992

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://golowaki.ru/strik?utm_term=the+essentials+of+computer+organization+and+architecture+4th+edition+pdf+download PDF link annotation
    • http://odemebayisitrafik.com/bovunewemewazekt778m.pdfIn PDF document text
    • http://moreprodukti.com/full_dslr_camera_appy0drz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370284/normal_5ff6acda20985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_6035799caa9fb.pdfIn PDF document text
    • http://sfr-espace.best/porazebanodokumikizotediqtd1q.pdfIn PDF document text
    • http://goods-amzon.com/widagurexopunaxigirosm86kk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366973/normal_5ffd008533f6e.pdfIn PDF document text
    • http://svoytrylend.xyz/kenibakrfvbi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_0358e58472e348b485030d517e10aca3.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_3b44b8e395a446a185df0f4fcccef673.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_2a99bb256ed1469ebff0841ae414490e.pdf?index=trueIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_aa60aa505eb74d15bd29738d67c7aa57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf9edbf-3244-410e-b8cd-d912fd745e46/can_get_directv_to_connect_to_internet.pdfIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_ed5980e12e234bfdad1ae6e1a5867532.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_b2264685c5394dcbaf7d959014cdc282.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e34ecc5-3328-4bbe-9d92-fd058d8ffd48/sukezawome.pdfIn PDF document text
    • http://mepomaxiwamuda.epizy.com/daxuni.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_b9ab13ae00b641dd97b1f8817ef53116.pdf?index=trueIn PDF document text
    • http://bunopudo.rf.gd/31195838058.pdfIn PDF document text
    • http://bapexuzajo.epizy.com/54840559306.pdfIn PDF document text
    • http://zititerawori.epizy.com/polycab_ceiling_fan_catalogue.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_c312c5f01e0f418f9bd492739885c1d2.pdf?index=trueIn PDF document text
    • http://favepos.rf.gd/13682051787.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_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 5748 bytes
SHA-256: 6da71c6555045ee4705172c914df6b4dc0b441b39ba460bee844c37f479b494d
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10228 bytes
SHA-256: 271cfe9e4fa8a5d4c7374a4c76ce756b0f30d33b3e0a0e290ffdea46a9900be5