Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9661505f7c2f76…

MALICIOUS

PDF

78.7 KB Created: 2021-05-24 23:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 034f42b0bc02959b54ac66532e97e5ab SHA-1: deea3f31c5441832fb4f8738f00d8669afa37a49 SHA-256: 5d9661505f7c2f76749d485f2ebf066e6476cb48ee9010eb13f6a0dc8fae733c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The document body, though partially corrupted, suggests a lure related to interview questions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=questions+for+mis+interview
    • https://cdn-cms.f-static.net/uploads/4445531/normal_601df7146719d.pdf
    • https://cdn-cms.f-static.net/uploads/4500447/normal_606a0b255ac57.pdf
    • https://cdn-cms.f-static.net/uploads/4369900/normal_6057b1c28c279.pdf
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/konotenopi_tomipagefazetik_pafof.pdf
    • https://cdn-cms.f-static.net/uploads/4376874/normal_6009bc8c5b9a5.pdf
    • https://static.s123-cdn-static.com/uploads/4375694/normal_5ff3d1502ffff.pdf
    • https://cdn-cms.f-static.net/uploads/4417998/normal_6062c5ab775bf.pdf
    • https://cdn-cms.f-static.net/uploads/4374517/normal_60504756321a7.pdf
    • https://static.s123-cdn-static.com/uploads/4420431/normal_600528cedb9b5.pdf
    • https://cdn-cms.f-static.net/uploads/4461761/normal_6024aca20c8e0.pdf
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/babodo_norebiduto_naxov_sebinu.pdf
    • https://cdn-cms.f-static.net/uploads/4417308/normal_5fd3d05c6d4d2.pdf
    • https://cdn-cms.f-static.net/uploads/4447641/normal_600a50d79d0a2.pdf
    • https://static.s123-cdn-static.com/uploads/4462350/normal_6005c9193613f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juwofuxufijup/kitchenaid_superba_gas_convection_oven_manual.pdf
    • https://s3.amazonaws.com/fedufiporara/logitech_k400_plus_mac_driver.pdf
    • https://s3.amazonaws.com/desekusoxi/developing_the_leader_within_you_2.0_chapter_1_summary.pdf
    • https://s3.amazonaws.com/jodabiladezot/accounting_for_dummies.pdf
    • https://s3.amazonaws.com/purufiz/netflix_app_free_for_windows.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e5.bin
b78a1b6f6b1d61256b6e0a26987750e641b7d4f387ddfd3de2a0fbe20dcc53dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 4884 bytes
font_01_sfnt_off00010a89.bin
8742beeb9fb960d527787e6293f72cfdcb3efd2960d994f29e5a5fd97a05cebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 10288 bytes

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