Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39c58b76500b44f…

MALICIOUS

PDF

80.3 KB Created: 2021-03-22 01:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4bb57b6142402c24a7837e82045fda25 SHA-1: 0ab2e660a5f24a0e9c6b37d52442f0a33fa2ff73 SHA-256: f39c58b76500b44fe4c42959dbd8abc2e7c16035b04890ec5985b83f0dd3d704
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs pointing to suspicious domains, including one that acts as a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'dog whistle sound', which is likely a pretext to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=high+pitch+dog+whistle+sound PDF link annotation
    • https://cdn.sqhk.co/nikofejujel/2GihjfL/kilumegivebi.pdfIn PDF document text
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/a297a1213f5086a.pdfIn PDF document text
    • https://funudenor.weebly.com/uploads/1/3/4/3/134319253/zurow_tukujufoxipav_jemebenod.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/nutopaludomufanefusuxi.pdfIn PDF document text
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/4564612.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/j1ohiib/vezivewal.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/gfhf8OK/battle_of_britain_major_generals.pdfIn PDF document text
    • http://xobezised.iblogger.org/92444874346.pdfIn PDF document text
    • http://tapodozinojet.mypressonline.com/67792480960.pdfIn PDF document text
    • https://puvukiroleta.weebly.com/uploads/1/3/1/4/131455247/wozedoxobavep.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/conjunction_test_with_answers.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/denuvanuve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rakejobik.epizy.com/pixakubufonotas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f424523f-42ac-4154-9306-a9d9c94e4725/gilafekuxig.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/lakunumukugegijowiwenuw.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/31904556817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5752f5b8-3bb1-4100-b3a1-50395326c3de/44469630412.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/bobinado_de_motores_electricos_monofasicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42be5dc-cbe9-4cf0-87da-4d9e4dda5e56/what_is_the_strongest_sword_in_sao.pdfIn PDF document text
    • http://foridifakusexum.rf.gd/33155692073.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/human_computer_interaction_masters_europe.pdfIn PDF document text
    • http://tabetoge.rf.gd/76503581877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce66101-9f0a-4a76-a967-da58b7b5ab63/69706771348.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 5084 bytes
SHA-256: 8a0d4107c44818819f2fa8762677db4a0adbca092875ad963be4896e18a029f6
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 3652 bytes
SHA-256: 55952d5fd8fc5d340f1a049c35fa11ad6fb6a8b84e0ab4dc3744493d08b717de
font_02_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 11044 bytes
SHA-256: 120ae8def83d26d923bccbabb6e5151778b906409e343940cee9ea60f9902a7a

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