Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c38c8466b6dbfb1…

MALICIOUS

PDF

88.9 KB Created: 2021-04-17 00:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2b4b6207cf5750b2c8b438116571f6dd SHA-1: 73323922449e5cc0cbfa624d9df8714ed0e216d3 SHA-256: 3c38c8466b6dbfb15beb5df83101bc6b7e4cd666d0185c48ce47bbb8fa0fad44
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm designed to manipulate search results or redirect users. It contains a large number of embedded URLs pointing to various disposable hosting services, with one URL specifically noted as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=icom+ic-706mkiig+microphone In PDF document text
    • https://cdn.sqhk.co/rowibimibopi/gKRihgh/dwight_yoakam_fast_as_you_meaning.pdfIn PDF document text
    • https://penuwoguf.weebly.com/uploads/1/3/6/0/136056634/vudizozele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_601da9a513357.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/godamevuxusiros_jugugovidi_venenanewefexo.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/gcU8rUC/this_is_the_police_double_homicide_solution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_6060dcae1fe47.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/gufijejo.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/hhijjZ6/rc_car_parking_2_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426974/normal_5fc92ef4af70c.pdfIn PDF document text
    • https://xijananok.weebly.com/uploads/1/3/0/7/130740199/wupilij_wivalolix_dosudis.pdfIn PDF document text
    • https://jakuxilo.weebly.com/uploads/1/3/4/7/134711712/1587630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_606244a2ef072.pdfIn PDF document text
    • https://nupowanekajotut.weebly.com/uploads/1/3/0/8/130815303/5893118.pdfIn PDF document text
    • https://raxuremaxu.weebly.com/uploads/1/3/5/3/135350699/5119130.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/ziduvela.pdfIn PDF document text
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/fotoduvorivofuxures.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_91f7f271f76b44529e6540585f333e52.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_91475e10580b46948551271b518b68e3.pdf?index=trueIn 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_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 5336 bytes
SHA-256: 06cf0a627c4d810c0a77d224bf7320bd926c5ecf48c0e2095395340fa4e25f34
font_01_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 10848 bytes
SHA-256: 9aa5c6dce142ff7706137ca647015bc2b421278fea0b981c95278ad7380898af

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