Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f84e173827cfd0…

MALICIOUS

PDF

74.4 KB Created: 2021-01-18 03:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 648ada9ee5a9ea8642baf7771f4a6278 SHA-1: 24f4d25d710d07a0455d0cb254d82d363250bf74 SHA-256: a9f84e173827cfd0e9e946936f1a7ffca7d9e1e91a1df9c13990b5d86cb2e4b1
136 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with at least one pointing to a suspicious domain ('trafffe.ru'), suggesting an attempt to redirect users to malicious sites. The presence of 'LOLBin token sequence' and external URI firings further supports the malicious intent of leading users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trafffe.ru/wb?keyword=black%20men PDF link annotation
    • https://site-1177540.mozfiles.com/files/1177540/contract_of_employment_free_template_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/pemazekefise/iFIghjh/kovaruwitinuma.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/uzggggi/rigijazunozepuwazolil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_5f928a40d60e6.pdfIn PDF document text
    • http://guvinesusavilo.iblogger.org/gallstones_spanish_patient_information.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/Ynjghxp/65974671884.pdfIn PDF document text
    • https://site-1178187.mozfiles.com/files/1178187/kanijaxejopugosisaxow.pdfIn PDF document text
    • https://cdn.sqhk.co/xeveweno/gchiidX/7766444010.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/jdThjFe/rodunujolapenotuvot.pdfIn PDF document text
    • https://site-1180945.mozfiles.com/files/1180945/xugunanupanasebixodisen.pdfIn PDF document text
    • https://site-1246108.mozfiles.com/files/1246108/bevasimovadomesonarotakaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/sikeperokukawumifov.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/solo_violin_sheet_music_book.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/gujutavevive/unblocked_games_2000.pdfIn PDF document text
    • http://guradewididexep.epizy.com/sawogidodoxavepovisufamoz.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/android_support_modern_authentication.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/hire_purchase_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/circuito_bobina_de_tesla.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
    • https://s3.amazonaws.com/vaxebisapesi/sikeperokuIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 5564 bytes
SHA-256: aceef146456fa1e86d5b9a3f7ac2b67201e92e5e7c4b3d3ae8ae497e2d6d2cd2
font_01_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 10276 bytes
SHA-256: 4cff24054e5dd8335f242a2e5a4a8e3a0203f54210ae2d5674866a3972c251fa

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