Malicious PDF — malware analysis report

Static analysis result for SHA-256 393ae43d0fbdf8a7…

MALICIOUS

PDF

73.2 KB Created: 2021-03-15 05:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 74e0f5d9648e78ca672b8409f239c59e SHA-1: 873c37b353aefdbb025025d845a1ac8e5b049d31 SHA-256: 393ae43d0fbdf8a7ba62dcc829ed1207c469a596816ea0ee6064db71d002b022
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL observed is https://botokaw.ru/strik, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=the+waters+of+babylon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413968/normal_5fe7272da7675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_6008dd3852a82.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/jhoQhhy/steamship_authority_parking_permit.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/87783330962.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/nhfjhjA/trailer_project_power_deutsch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_5fd7f618b6b56.pdfIn PDF document text
    • http://folejaf.mypressonline.com/fadapivijexebuvoful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470688/normal_6023d223d5356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_c9ada8922e1e4af8a1574f9bc47c4e76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonima/my_water_heater_pilot_light_keeps_turning_off.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/are_propane_tankless_water_heaters_worth_it.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_0cc649e83c0d41b990e5159f35b64a53.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_e0a015c7a0734d5692f2bc8b6cea76da.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_fed0cd9c9f4c4457bbdda647b8152d54.pdf?index=trueIn PDF document text
    • http://lijowavatajo.myartsonline.com/66396747665.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_66b348fb7988495b835207d657d74a5c.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_c25df1a203f04adb9bdc0ecda8fba850.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_389b62a97e8b4a99bc4cda04d67a7608.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 5136 bytes
SHA-256: 36221e221527e7e9685429439329ed4ffb8190e6142418c350d38c4d2cac7c3b
font_01_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 10444 bytes
SHA-256: 497a27f3688c9403f85485ec6322c44875a72e7b1a456c94398b1ae0c41b1363

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