Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd7175ffafcd679…

MALICIOUS

PDF

93.7 KB Created: 2021-03-18 22:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e553f8b696ee41fbc734db1a5d4206 SHA-1: 839f52ce622e45a2ffe3811816a2ad90ffc4b21d SHA-256: 7bd7175ffafcd679d07d08b3913485de8d029a4d5ecbd3f54007933649191894
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=playskool+kota+my+triceratops+dinosaur+manual
    • https://static.s123-cdn-static.com/uploads/4393911/normal_5ffc649067c9e.pdf
    • https://cdn-cms.f-static.net/uploads/4415526/normal_604fbe561152e.pdf
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5ff0b3d3cc97f.pdf
    • http://mogimetekojubar.scienceontheweb.net/72236290009.pdf
    • http://fumuroruzej.medianewsonline.com/61227843239.pdf
    • http://wovoradomumakil.medianewsonline.com/que_significa_fotografia_aerea.pdf
    • http://witikotuxigere.scienceontheweb.net/88213123901.pdf
    • http://berozabekep.sportsontheweb.net/41307234948.pdf
    • https://cdn-cms.f-static.net/uploads/4406170/normal_60502bf82ccb1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tiwobera.rf.gd/minecraft_for_apple_macbook_pro.pdf
    • https://s3.amazonaws.com/pajukovuxetu/65233566358.pdf
    • https://s3.amazonaws.com/sitozi/xujipokegugimeguluku.pdf
    • http://tonerud.epizy.com/lightweight_reader_windows_10.pdf
    • https://s3.amazonaws.com/jepinebawo/jopufemok.pdf
    • https://uploads.strikinglycdn.com/files/d93755c0-cdbd-4603-a9d8-cee31f04f40c/35496284693.pdf
    • http://kodibonu.rf.gd/automated_tests_for_android_applications.pdf
    • https://uploads.strikinglycdn.com/files/fa787738-3d87-40d5-a645-c3ede3517206/grafico_mapa_de_riesgos_excel.pdf
    • http://nibemodida.myartsonline.com/world_inventions_and_discoveries_list.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e0a.bin
2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 6440 bytes
font_01_sfnt_off00012dff.bin
59a4c84c9c4e63bd8770486040714fba35d559bb743de1a6bd8f74df6bf01e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFF 5388 bytes
font_02_sfnt_off00014045.bin
bde30e1dc2a0fc5ab794605bf7f132540e89670c9b664c1245e6c3d548d4e495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14045 12256 bytes

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