Malicious PDF — malware analysis report

Static analysis result for SHA-256 4083465f719e7b2d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 00:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1263e4fb9a3cc3dee6dd78b8f1ca353 SHA-1: f8b7fbf5679a473c2eb368aecf2719ad1ebacfe7 SHA-256: 4083465f719e7b2de4ef2c220095a41fcc516335b4ea9a691e3882bfcca5486c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/uplcv?utm_term=bloons+td+battles+mod+unlimited+everything PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/73697454809.pdfIn PDF document text
    • http://z500.si/files/37847258633.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/75506943350.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/63050101555.pdfIn PDF document text
    • https://huanghecables.com/d/files/26437574374.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/91815780268.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/66689444409.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/48489736086.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/fopevogadakal.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/5391140924.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/budatud.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/sesazisajizirawitewezokif.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/90934435408.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/84048246573.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/17137591810.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/jitimagakuta.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445127c1e85---romifidedut.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/vadowejisokaza.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/43993034306.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/bemidid.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/kiderewotedulukopamatibeb.pdfIn PDF document text
    • https://datajournonepal.org/files/wuzanobulironepabogij.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/76390827675.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_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 11168 bytes
SHA-256: 733dfe829eaa59042642c8f116345b14d6aa4eafd427cbbc4c8eeb99114b62f1
font_02_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 16760 bytes
SHA-256: 92358f426f5b9d66d61335cd004ddce6b170b5f62f912998a9cf2cfe7ba4a1bb

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