Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f79bc773e65c60a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 04:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e4ba428614b472828aedc3e5853c2da8 SHA-1: 0d557877e850fee98db213ea360fcf5304d189a3 SHA-256: 1f79bc773e65c60acec52cdbb538b0711974df3016426e6376e7aa83d21d1c37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=face+unlock+android+10+apk PDF link annotation
    • http://mtecommerce.it/public/news/file/jevizubafufifatemepig.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/54482131977.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210909091454.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/xepujojuxakope.pdfIn PDF document text
    • https://vleek.com/uploads/files/42454073976.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/62280400133.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109042153415837.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/sunumezabezujuvevuretug.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/8097377381.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/xemakaderareg.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/41791042735.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/64346009192.pdfIn PDF document text
    • http://vitrine-prof.com/files/87016314146.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/boxosunidarofiji.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/4760521918.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/40136467008.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/gaxutugozukadewepexix.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/darosonilobabojafoba.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/41439976706.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/25251758949.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/75332318315.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 19684 bytes
SHA-256: 5eebcafa2bbdc158e1d9a501c1fe2a5da25919b4a138dcd7ed34872ca1344d5f
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 10584 bytes
SHA-256: 4b9f1f23ee2682cd83f15680cc9635999b2209a94cb81693debf334b4c853d18
font_02_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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