Malicious PDF — malware analysis report

Static analysis result for SHA-256 c690458b080d9008…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 19:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fac51f691394dff97c268060f04847e2 SHA-1: 744cd499e83272ebe3915f04038ac7d1598a9eb3 SHA-256: c690458b080d9008b615350e3b9ba396e4b8a321e7f9d4b6741532b2075e8de2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous external URLs, one of which is associated with 'free roblox gift cards no human verification', a common lure for phishing scams. The PDF structure and the presence of embedded URLs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=free+roblox+gift+cards+no+human+verification PDF link annotation
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/59563553857.pdfIn PDF document text
    • https://aneri12.eu/res/file/64743572918.pdfIn PDF document text
    • https://wasael.com/userfiles/file/xifenilenezi.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/84990594836.pdfIn PDF document text
    • http://ahchala.com/img/file/28798143368.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/58176682678.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/tixanowi.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/gofawagixifi.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/jisiponu.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/75447225082.pdfIn PDF document text
    • http://gaudi.tw/upload/files/44248876037.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/36927973441.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/viravowaditonu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b622f44f---kolilarufeb.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mogelutiwuwulesugunawo.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/81178299580.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2785f1dd971e1311de6e112e805ad51b/jusebapu.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/zesajufavakakekorug.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/48082560896.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/limawamolubup.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/17597204511.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090304175073499.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/duwilexawajomo.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/95707694426.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_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 18576 bytes
SHA-256: bb5175fc488d7056735054419197b46832b7ae5b8ce0c9d59272d37fa76371b5
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 11308 bytes
SHA-256: e46d02d6599bf1e120b3561c23ed061183188a4cea84d2207ef5e4b6e7bca9ce
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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