Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c02d687dcb276c…

MALICIOUS

PDF

91.7 KB Created: 2021-05-28 10:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 06249be09ee615487f1941e2f3906d89 SHA-1: 7ed022484ddf18c68a05f6f5ffc4ad1ddbc40cff SHA-256: a9c02d687dcb276cd38597fe6ff808ef398e11b8f138d5da2e4b0251f99bbbf0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of numerous external links, some on disposable hosting, supports the attack pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=flor+y+canto+guitarra+volumen+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454182/normal_606d236a4f85e.pdfIn PDF document text
    • https://sijupazijeter.weebly.com/uploads/1/3/4/6/134639914/woduj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_603e7de42f666.pdfIn PDF document text
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/7715661.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/4074096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_6034855223d91.pdfIn PDF document text
    • https://dikodaselafilug.weebly.com/uploads/1/3/4/1/134108642/parajoroz.pdfIn PDF document text
    • https://lujonojezim.weebly.com/uploads/1/3/4/5/134588784/lazoveg_lefarawapuke_xuloxaridumoso_zosenuzisixi.pdfIn PDF document text
    • https://gopojobazisedi.weebly.com/uploads/1/3/1/4/131436977/9b936f12a2b2c8.pdfIn PDF document text
    • https://benowanazopawa.weebly.com/uploads/1/3/0/7/130740092/mosugebeser.pdfIn PDF document text
    • https://puvojokuxika.weebly.com/uploads/1/3/5/9/135985507/jigonof.pdfIn PDF document text
    • https://sufepupebesi.weebly.com/uploads/1/3/4/6/134636280/mipozuroko.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://uploads.strikinglycdn.com/files/290d6ef5-b0b8-49ae-83b3-b7b213263f92/kememegowefuzunoguvupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe2d5c6-1692-459f-aa09-4c32cc03d100/canon_powershot_sx100_is_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/188cf6de-e690-4a3c-8421-ca63a132e7db/ca_real_id_drivers_license_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc132b9c-07a7-4af9-800b-6e5a49e36e0c/82608160136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6035fa-c023-46b3-b8e6-55447326cf02/1069116185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40059d86-cf8d-4750-8352-cc8a6fef39ab/how_to_go_low_carb_but_not_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e568a961-b248-4654-bc7b-51eb2e8e356a/paw_patrol_coloring_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e3bc58f-8aa2-4947-b33e-cabed13743d9/98251555907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a229472-4ac5-47ca-906f-d4ba0d344fc3/ejemplos_de_derechos_humanos_en_la_escuela.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001180b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 5072 bytes
SHA-256: 17f79773a98ce4495cc3e6d5df5f171df5e3a66b2adec2409af9786a912aa212
font_01_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 12748 bytes
SHA-256: 07eaf2f5eba1cef7500f10822543b4d88ea39eb0eac2e692e9e094ddfa635f55
font_02_sfnt_off000151b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c