Malicious PDF — malware analysis report

Static analysis result for SHA-256 846fb72d5a30b176…

MALICIOUS

PDF

76.9 KB Created: 2021-06-05 05:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1234b88a49c12033ca5e1a46e69d7198 SHA-1: 116ff66a6f5dcba4cdfebf8a1af17c3bd7a5e7d3 SHA-256: 846fb72d5a30b1762c45b16510a05afd18fe4c3a4388618761511d0e024d6744
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external URIs, with a high concentration of links on disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and external links point towards a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://ponafet.ru/123?utm_term=centrale+sans+light PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469353/normal_601f0f203ac6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_6016fc25b50f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491946/normal_6020b9ea00045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fc7119e9cafd.pdfIn PDF document text
    • https://betiriwusogaz.weebly.com/uploads/1/3/1/3/131380032/8f06c002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5fe8517870422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_604a0d3ad65ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446036/normal_6007d10a38614.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/zofuvali-pekokemofar-kediwobipale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5fe91624a65ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaguseka.pbworks.com/w/file/fetch/144643644/98414020077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddcbc853-d2d9-47b4-8129-9b1036c6bff9/lasirelapewifesukut.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144640596/12168924146.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/vivuwakiwojiniri.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/f/xiaomi_mi_box_4_android_9.pdfIn PDF document text
    • http://demopefo.pbworks.com/w/file/fetch/144602943/37377674951.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/monosacaridos_disacaridos_y_polisacaridos_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4550fb-f3ad-4a61-897e-3de1fdeb6431/divine_mercy_sanctuary_stockbridge.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/w/file/fetch/144464784/abbyy_finereader_crack_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a151c6ae-6113-4b62-a0e9-817d93c34e61/oc_warrior_cat_names.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://scripts.sil.org/OFLIn 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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 4852 bytes
SHA-256: 6263882f28309eda1d170e3beff4929fd9dbaa637c287c4ecb897661977efee6
font_01_sfnt_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 11144 bytes
SHA-256: 72412af5065acdc6bb3906d12ef15916f36278dd7d4a88f0f19c1a1779cc420b
font_02_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 16084 bytes
SHA-256: e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee