Malicious PDF — malware analysis report

Static analysis result for SHA-256 b257ae0a39e97f9a…

MALICIOUS

PDF

80.5 KB Created: 2021-04-07 22:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3111f6adf0ca42c41ac4babb9b1ae746 SHA-1: 28ffb6ad0d8b7093b7f2e81aa9f967ce1455d032 SHA-256: b257ae0a39e97f9a14598f0e84e6d2f1caf8c2d8f371fbc7cd38b36fadd06aae
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document body's deceptive content support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mezovuduw.ru/strik?utm_term=what+is+the+definition+of+body+mechanics PDF link annotation
    • https://cdn.sqhk.co/nomitusibop/hjsGphg/atomic_fighter_bomber_mod_apk.pdfIn PDF document text
    • http://getfreecreditreport.info/asus_eeebook_x205ta_driver_updateqxpm5.pdfIn PDF document text
    • https://cdn.sqhk.co/nexuliwadi/S4wjshf/last_day_on_earth_survival_ios_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/UizRWjj/multiple_facebook_accounts_on_instagram_with_same_email.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/E0Mifjj/adventure_island_3_nes_cheat_codes.pdfIn PDF document text
    • http://cheapestshop.xyz/64224790117qyo3z.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/iQUaziJ/71539959905.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/3difIv1/fonts_free_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/rAGuEjc/first_words_flash_cards_jojo_maman_bebe.pdfIn PDF document text
    • http://slamelina.website/estructura_de_lewis_ejercicios_resueltos_3_esoe34x9.pdfIn PDF document text
    • http://sefobadivura.iblogger.org/77117697074.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/JjcXUfw/39715423493.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/yhabjiz/wugufosirunufodekiguz.pdfIn PDF document text
    • http://micrometerdigital.xyz/88637927018e75f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_c60f7702523a47239b838f3e9c709a1c.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_6954c615c8e5476c93ef85d886112143.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_8ae2e1f40a614a4f9e11ae5443283d16.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_994ab7bae7994cee8bdeea68264b4168.pdf?index=trueIn PDF document text
    • http://gomanezobovo.rf.gd/diablo_3_barbarian_builds_for_beginners.pdfIn PDF document text
    • http://vetozidute.rf.gd/83196544453.pdfIn PDF document text
    • http://vikalasur.epizy.com/zagazitigezunawemabusoj.pdfIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_74d126cb2cce442a8a2d72ff56ddefd1.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_6f2819bd92dd4399ba3d38c40abbf449.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_f24d1bb00f754b6890ad8d58b547b99f.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_4c604a1609ee431fabaec495710b6feb.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_ef9dbef873844d79acf1e674c67c13ae.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_928b8a5d01d14d408f490ccded7e7c07.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_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 5388 bytes
SHA-256: 03c6bcc6e407fa7cffa26fbe414ac0e369655a77e96257e6360b1f9975d9cd3c
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 12216 bytes
SHA-256: 69f58909c126ce0b3ffd2a9871a3efae9136c4e9d58ca2bffd90ec68cedd0594