Malicious PDF — malware analysis report

Static analysis result for SHA-256 57816d954b682b65…

MALICIOUS

PDF

153.5 KB Created: 2021-04-22 05:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d021058626dffb539e5be8ff11e7de87 SHA-1: 21defd4d3fcfd0393346ad1f614c852598fbb03f SHA-256: 57816d954b682b65081c6f632a15615444191cc72c1bfb1ac39b0459b6bb81ce
184 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, appears to be a lure related to 'The boy in striped pajamas' to encourage clicks on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=the+boy+in+striped+pajamas+summary+chapter+8 In PDF document text
    • https://cdn.sqhk.co/pefibovip/jeNgjQ7/sunurifolifatirudubivaxuw.pdfIn PDF document text
    • https://cdn.sqhk.co/lazogapuvo/sngeSgf/51522807095.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/cpjhLAj/volume_increase_software_for_windows_10.pdfIn PDF document text
    • http://xazixovabifin.medianewsonline.com/87449044626.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/ihdJigK/arijit_singh_songs_download_pagalworld_mp4.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/gefigukazepajasafadibilel.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/kuzis.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/braveheart_sheet_music_piano.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/what_is_a_major_reason_the_renaissance_began_in_the_italian_city_states.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_5833d26555fa4d7e9db85da75e1b66a1.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_373b3f4c9c5d44a794050e6967f19615.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_c4d79241e1ae49bc97533270831b35c6.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_3e7373850a8a48a6bd735bedd17e0de1.pdf?index=trueIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_3ecbe016307d45f8afd2e8dcbe794159.pdf?index=trueIn PDF document text
    • http://kebenubes.onlinewebshop.net/beomaster_5000.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_760693aab6a249b58d989a7dba146141.pdf?index=trueIn PDF document text
    • http://zedowep.atwebpages.com/hakikat_ilmu_pendidikan_islam.pdfIn PDF document text
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_c4dea733983d457389557bedab21cbc1.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_239d9dae4fa74584a10bf5f57ab6561e.pdf?index=trueIn PDF document text
    • http://nibubatovavav.atwebpages.com/tizijajamijimavalili.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_1b6a346c96664fb182c9d4f4370c6395.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_aaa59cbaa211482a83a0ca1a2cf74ee7.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_9d5321bcce34482cb2646909b7ca7952.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_18d006635d8f4d22ae2ad169e7f949ac.pdf?index=trueIn PDF document text
    • http://suvalomimo.atwebpages.com/43561930163.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B94 5624 bytes
SHA-256: d8b70399f7909ddd8e9789c5fd12529f217e361e718986cb92792da5b36f5ef2
font_01_sfnt_off00021e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E75 12192 bytes
SHA-256: a4d0a7e3f68888b8bcbfd97b0e996a325d45a80422d4af078fae3f22ef9a7af8
font_02_sfnt_off000247b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247B1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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