Malicious PDF — malware analysis report

Static analysis result for SHA-256 77831e8a1c90d662…

MALICIOUS

PDF

102.8 KB Created: 2021-05-31 19:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc5c6209827cfcd036b7b63fedf9255 SHA-1: 23d09bbede8b3ce975b7b4590c56a330e57876c8 SHA-256: 77831e8a1c90d6623cac07beda569f7216576012d231b1a1b197b762d3ef4e50
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a driver download lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/pbw?utm_term=synaptics+smbus+touchpad+driver+windows+10+1909
    • https://cdn-cms.f-static.net/uploads/4465142/normal_6019831624278.pdf
    • https://static.s123-cdn-static.com/uploads/4464865/normal_6007a356f093e.pdf
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5ff1bde4c59f8.pdf
    • https://gudozegibuxof.weebly.com/uploads/1/3/4/7/134732985/5362798.pdf
    • https://cdn-cms.f-static.net/uploads/4414169/normal_603ad1bda055c.pdf
    • https://cdn-cms.f-static.net/uploads/4381094/normal_601460681949b.pdf
    • https://xepuzuzolewu.weebly.com/uploads/1/3/4/3/134324818/e0d58da6334.pdf
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fcf051eeeae3.pdf
    • https://nogekapufininut.weebly.com/uploads/1/3/3/9/133997605/diwep-zuvopesiv.pdf
    • https://fonuwinozizanam.weebly.com/uploads/1/3/1/4/131408397/fekekuji.pdf
    • https://cdn-cms.f-static.net/uploads/4464330/normal_601b3ec4c32ef.pdf
    • https://gevofiku.weebly.com/uploads/1/3/4/7/134759045/povak.pdf
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/1418789.pdf
    • https://miwuxivuse.weebly.com/uploads/1/3/4/8/134863076/054ee0d.pdf
    • https://xitititoludazo.weebly.com/uploads/1/3/5/9/135987602/movusu-manutususixigu.pdf
    • https://kezevipamamof.weebly.com/uploads/1/3/7/5/137516373/bowipilijafufiwi.pdf
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/xokiwarise_fakagedadijuna_tipadev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://palixazoke.pbworks.com/f/how_does_the_death_of_the_scarlet_ibis_foreshadow_the_death_of_doodle.pdf
    • http://xawaren.pbworks.com/f/ferivatagurova.pdf
    • http://nunaruribeg.pbworks.com/f/bartending_tips_and_tricks_for_beginners.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144421065/64699834428.pdf
    • http://xoxafepapesu.pbworks.com/f/nscdc_shortlisted_candidates_2020_for_physical_screening.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_off00014fb3.bin
88414aec37541520a9a4d964a44ada7add7463a44d923c33e5ac2299ea0611d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB3 6128 bytes
font_01_sfnt_off00016476.bin
f909c4f9de309cdf35f3c8938f6cda0f3527f84cf6c6f9e52d9748fb9b02fcd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16476 12048 bytes

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