Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bc1c1dc6ce8c56…

MALICIOUS

PDF

81.9 KB Created: 2021-10-19 02:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 716204c0ddac7e8a0a1ea784e800b3a6 SHA-1: 60402aae7f4850052b42ed70c65fec3451a213de SHA-256: d2bc1c1dc6ce8c5670defe79e6fb0eb1d03c7a8f756baf5041748cfc91deaaab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs that redirect to other PDF files, likely to obscure the final malicious destination and evade detection. The presence of many distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.aledrukujemy.pl/ckfinder/userfiles/files/27928601806.pdf In PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/pumaviburijegujuterug.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/88471875086.pdfIn PDF document text
    • http://dsagco.com/Upload/file/vokaxigifuvub.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/57570104480.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/selinejutosajawefe.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/080d1f5cb93492997477165caf2033a4/84118548372.pdfIn PDF document text
    • http://schubert-hh.de/image/file/defabakiporinuni.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/58941220260.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/gojodejikaxunak.pdfIn PDF document text
    • http://youth-myth.com/userfiles/file/60386247433.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/df4df11bf93693f0e2f8e49877184ede/wixox.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/forabopoxet.pdfIn PDF document text
    • http://sushibelovo.ru/files/90208457654.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/valino.pdfIn PDF document text
    • https://ratoempat.com/contents/files/ziwerejorukemomexu.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/94293853324.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/manisixomowafa.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/repomuxodasunipujukasovod.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/26480411338.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/sasijubojarixomoxumiju.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/98336017566.pdfIn PDF document text
    • http://kesifveotesi.com/files/1026222931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=skyrim+se+creation+kit+steamPDF link annotation
    • 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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 18908 bytes
SHA-256: c1828ee19ed26620e25242a106dec8d6866613365e26a6241a844da4fdfa4ca5
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10624 bytes
SHA-256: 901456527d3745ba89ac41744ed7762be283ed17499c00302679d4173044174c
font_02_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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