Malicious PDF — malware analysis report

Static analysis result for SHA-256 d357f646a6680eb8…

MALICIOUS

PDF

60.9 KB Created: 2020-11-18 00:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1057bb71cae8091aeb5232dccf3ebdef SHA-1: 6dcd94897e18143a0987c31e7bb1e59ce9a891dc SHA-256: d357f646a6680eb834944f09117038455c527389c6ad41ee89defe6ed21094ea
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The primary URL suggests a lure related to movie streaming. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to malicious or scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=harry+potter+8+t%25C3%25BCrk%25C3%25A7e+dublaj+izle+jet+film
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/1185260.pdf
    • https://zovewobaj.weebly.com/uploads/1/3/4/7/134719332/seromeduvufasew.pdf
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f90397619f05.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5f9833c5ac0a8.pdf
    • https://farukipem.weebly.com/uploads/1/3/4/4/134473356/semije_fivap.pdf
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5f8fecfbb52d2.pdf
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/95e0382577e.pdf
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/loniwof.pdf
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/1300040.pdf
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/2d11b91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fekazudabo/rimobapakilamowegujolok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae95.bin
948c8c3f85f41fdb13d258f43755ff6a12c4a7fba3a67a21c9319c39dee0e150		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE95 5896 bytes
font_01_sfnt_off0000c278.bin
bd710ac0824d9ceb46b74d9a1aabff22edb4c3478972e3c3ba82348182f6d389		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC278 10744 bytes

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