Malicious PDF — malware analysis report

Static analysis result for SHA-256 e474291b6a979570…

MALICIOUS

PDF

65.6 KB Created: 2020-12-20 21:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e286e057067f4dd5bfdb7e327ca24647 SHA-1: 859526a1c9e1ec3a7f6eba1183bdc66da8ac7d30 SHA-256: e474291b6a979570f1449012b31fedcdc830a0c872a5bcb50b9818da26d4c6f9
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with many pointing to external PDF files hosted on disposable domains. One critical heuristic indicates these links are part of a redirector infrastructure, and another flags it as a link farm. The ML classifier and ClamAV also identified this file as malicious, likely due to its link-farming and redirection behavior, which is often used to distribute malware or phish users. No scripts were extracted from this sample.

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://ggtraff.ru/strik?utm_term=redbrand+hideout+map+printable In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/zokare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_5fd5fc982be2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375195/normal_5fce8e28e9f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5fbb1a8be857f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447098/normal_5fca278882ef9.pdfIn PDF document text
    • https://lalonofinesuver.weebly.com/uploads/1/3/4/4/134442061/dizemakumem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_5fba90f7bb330.pdfIn PDF document text
    • https://tigafuxofezez.weebly.com/uploads/1/3/4/3/134363272/negejusazove_zirigoletuzo_lofaxi.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/kevobizab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_5fd2876a610a2.pdfIn PDF document text
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/02b4e5c263fd2b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8652c4-f167-46c7-9666-4b911710a668/mens_health_yahoo_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa96f881-5a23-4182-8bc5-95e528304933/40487904707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ad5d68-e011-4024-aa3c-00bfcef53371/52620052610.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_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 5168 bytes
SHA-256: 1e54ea33e7eb3fb23fb5c08d0db31dc46f163c0f24fb807ec512dd6b4890052c
font_01_sfnt_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 10660 bytes
SHA-256: 892507c60da4ce97bc97830d27e348f808fdf5871631752af1b971e35a8388d6

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