Malicious PDF — malware analysis report

Static analysis result for SHA-256 1686aa71ac9c9b91…

MALICIOUS

PDF

77.2 KB Created: 2021-03-04 07:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 06663365cf9aeb3797502dd278d863af SHA-1: 267a27d526fb8b2845b36df7490bba453fcb8c08 SHA-256: 1686aa71ac9c9b9112f721c1b902ddc1d539a1ea0ec1c971761942f456f6768d
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to known malicious infrastructure and a large link farm. The embedded URLs point to numerous external PDFs hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=briggs+and+stratton+power+washer+675+series+oil+type In PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5fdd735d627de.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/xutorolodebotibidapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5fd70fd9aca1b.pdfIn PDF document text
    • https://gorasamigizutod.weebly.com/uploads/1/3/4/6/134600185/nibop.pdfIn PDF document text
    • http://peludofnor.fun/2008_jeep_liberty_user_manualqubxq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_5fdc14ce0c138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_6023f0ea1dbf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_6020639b63be0.pdfIn PDF document text
    • https://xuzabuteke.weebly.com/uploads/1/3/1/3/131379980/ronuwoleligov-navamebudo-vidave-jufuzetavukuz.pdfIn PDF document text
    • https://dujewukemapaf.weebly.com/uploads/1/3/1/4/131453220/tejapegavovadebaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fd2ef2f1aeaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5ffb1bf032c08.pdfIn PDF document text
    • http://mkr-olimp.info/microwave_coplanar_waveguide_simulationbm9hd.pdfIn PDF document text
    • https://bobovisosusare.weebly.com/uploads/1/3/5/3/135394734/ec4f99e21a18f.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/what_are_your_3_body_paragraphs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5ff42aba6801e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fcfb43bb5873.pdfIn PDF document text
    • http://peskomment.ru/corrida_gumball_3000haq91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 5820 bytes
SHA-256: 34e2af6f675e1739659ca2fe6490276b60cf4134acc863d6dac1aeeb3202120e
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 11504 bytes
SHA-256: 180dc28e3cd690b600845212c0048b2232edb7b4f136f52f1cbcb7c6e8e0b634

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