Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b4218fdf4596ea…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 11:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a22f8aff3f5a9f72693c46a819ac35d SHA-1: 7e5e4fd4541412a20eed403757ea583c71196ded SHA-256: 44b4218fdf4596eae21a8efbf90c08884d260016e6fa4b672545d3983ba7f999
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://zoop-tech.com/ckfinder/userfiles/files/38894324993.pdf In PDF document text
    • https://heyratacademy.ir/file/58327691075.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/62498795084.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910215940.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/bolabukusupurera.pdfIn PDF document text
    • http://jump360.co/upload/files/20210902041241.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1362279181613ea126b0d32.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/36613103753.pdfIn PDF document text
    • http://arsvet.ru/img/upload/jorarotudegabot.pdfIn PDF document text
    • https://electroagro.es/pub/files/kizokoporeregixiroji.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/mufabinubiloxifaxurex.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210913_F5614ED052EE33A8.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/79457404584.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/48329631952.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/legibujemopaluradudofi.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/38782222787.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/93dni3ocvvklt8dnfed1pi1f6p/kitorovitafulefofarogugi.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/pumuditenur.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/kodojivuna.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47a1b36f3---lewamitomeridogi.pdfIn PDF document text
    • http://banquat.com/userfiles/files/xavemobizizizujebinola.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/3825491204.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/17851945327.pdfIn PDF document text
    • http://tid.vn/upload/files/65781186959.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wodoviwepaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=add+widget+to+lock+screen+s10PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 18036 bytes
SHA-256: 8114bc83b7b2a6a0bd94703484eb1c2a508ae27c788384ea3b470a6dc3bc9b92
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 18132 bytes
SHA-256: cb09e8f4368752351ca1a80332361eb259ce0153371bffe8a8af50eb25baae33
font_03_sfnt_off000135a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A8 10716 bytes
SHA-256: 7f8727d97ad9928bcfb80d944530cab125a24aba1530dcbb7513f4b8fcc2d720