Malicious PDF — malware analysis report

Static analysis result for SHA-256 05412433ce12d1f1…

MALICIOUS

PDF

81.3 KB Created: 2021-03-07 13:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7a60b86702745b457aaf3c0449db4fe6 SHA-1: 6322cb74a47f6af68859c5fcfcbb1fb929243ad5 SHA-256: 05412433ce12d1f1e4bc9dc35fc549324b01c143000c88cac167eef9243dbaec
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. The presence of a URL with a 'keyword' parameter suggests a phishing or SEO-based lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://seumenha.ru/wix?keyword=roblox+how+to+make+a+car+crash PDF link annotation
    • https://cdn.sqhk.co/tamupoto/Tgk18hi/wyze_cam_pan_outdoor_case.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5ff797855cb0a.pdfIn PDF document text
    • https://cdn.sqhk.co/dakusoripujo/AjhKPhC/strawberry_shortcake_pocket_lockets_mod_apk.pdfIn PDF document text
    • https://nelovemisero.weebly.com/uploads/1/3/4/3/134347795/tevapegej-rotupazidowaj-liwomovibovad-lulod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_5fca081ba16c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_6016314f20e04.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/bpfWJk6/guxujodukowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_5fd1336edf965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5fd959fef21a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd640c0dbcac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392452/normal_5fcbe257a7309.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/JZhbHrG/65922323196.pdfIn PDF document text
    • https://fusazalokedukek.weebly.com/uploads/1/3/4/7/134729088/d5e52d7.pdfIn PDF document text
    • https://renijekut.weebly.com/uploads/1/3/4/3/134306869/9339121.pdfIn PDF document text
    • https://guwazexapa.weebly.com/uploads/1/3/4/7/134706575/37e0d8a.pdfIn PDF document text
    • https://nijegowililuxis.weebly.com/uploads/1/3/0/7/130739340/302cc4b459f630.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_06df81ed8bce48aabadd7ae1ccf12e36.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_d8d605b625d74ef192066494026020e1.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_9d22d531b9894327992be339009f98e9.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_c84f10458e784e6781f6081a31ed6134.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_9715e17c5d1b4a4d8e7fe8b535cbf32c.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_a27368ffdca04913a672337311e383ec.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_43185fb2199f4a7a9d49720a4a29d9e6.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_3f79a94b070943fa8701aeced0704a75.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 5408 bytes
SHA-256: 4ecdbe13b4fd7c47a00a2b300617b01273cd3fba563a9a507cfabdb9c3239d47
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 10796 bytes
SHA-256: 18a5fd3435799107f7c7b5d9825ca68a1b950525704302ecdb33e2578d61bd65

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