Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8464825305beb1d…

MALICIOUS

PDF

62.3 KB Created: 2020-11-11 08:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f390b49c21800b78fdc8fe78a46109f9 SHA-1: afe4915227b90bd7dcb15c5cf157946e7b91a80c SHA-256: d8464825305beb1d8c4ee067fb07e09c4c45530d0230d53295875b7b0141d798
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links pointing to various external PDF files, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://traffmen.ru/123?keyword=happy+wheels+on+unblocked+games+at+school+66'. The ML classifier and ClamAV also flagged this file as malicious, supporting the assessment of a phishing or malware distribution attempt.

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
  • 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://traffmen.ru/123?keyword=happy+wheels+on+unblocked+games+at+school+66 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f8ba9b97ed66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5f9d3636702e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5fa66d7f518fe.pdfIn PDF document text
    • https://sanofawuvi.weebly.com/uploads/1/3/4/5/134588151/wuguj_suxedikiw_lorimo.pdfIn PDF document text
    • https://badipixurer.weebly.com/uploads/1/3/4/4/134456466/wokaxot.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdfIn PDF document text
    • https://jazakeramexevam.weebly.com/uploads/1/3/4/6/134615015/lejizirix_jolovokapuk_manele_bozasemol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5f95b12fb2bb1.pdfIn PDF document text
    • https://zeburunonuf.weebly.com/uploads/1/3/4/4/134458398/fojomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5f9e598ea09ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5f9a2d4b7cc36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_5fa61ec02e9db.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/foviwiweda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/20517669646.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/william_thomas_grant_wikipedia.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_off0000b587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB587 5904 bytes
SHA-256: a44e873ee71520614a63c8bfdfb15287a35b39ee5c84d9181b078e0c043b5e82
font_01_sfnt_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 10212 bytes
SHA-256: 1caf80c132662a417923a3afd41b860ee56cd1c9f88a5eea1b11c54585823ec6

Open this report in the interactive analyzer, or submit your own file for analysis.