Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1e00374a6f67b6…

MALICIOUS

PDF

83.4 KB Created: 2021-03-23 13:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1315ec0e56dbf76d3867ae8c4ad2e11e SHA-1: 70113d2ad0a10f81a53a34b41cedda60e4551740 SHA-256: fd1e00374a6f67b67b5435ce76089deb4ff9cce0823dc1d6a577184e5f6b8987
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 detected as malicious by ML classifiers and ClamAV. It contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://jumiwimov.ru/123?utm_term=insert+tick+in+excel+sheet PDF link annotation
    • http://xuxetosufuzo.getenjoyment.net/oregon_chainsaw_sharpener_angles.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/beam_deflection_equations.pdfIn PDF document text
    • http://gromstroy.com/calculator_photo_hider_apkcy6im.pdfIn PDF document text
    • http://hotsales-com.xyz/wordpress_user_permissions_plugin1hmph.pdfIn PDF document text
    • http://smirno.life/biwusaxenoxibojixejdcdl.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/41737742579.pdfIn PDF document text
    • http://parralax.net/anime_colouring_book_onlineas94f.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/learn_japanese_book.pdfIn PDF document text
    • http://rastet-malysh.ru/josigivofuwufamfd2x.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/sigusukusewabalukodew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/99441881948.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_86936a90bae64f96971074b496a85a8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0927e44-ddf3-45a6-a9d2-abb9541cdab1/what_are_some_good_python_projects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bb2723-d1ed-4c8f-9ee1-16ec5ffd4083/how_to_claim_barclays_phone_insurance.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_29afb1d59a484499bbc03aeb82477aed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad777b9e-6df1-4c02-a924-da5413476a35/jonenevenibujujexorumuvu.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_ff77e7cff61946ae8ffff8f4db13a1c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/735a57be-62de-4343-9dc1-0cbf3acb3a2c/buzz_lightyear_helmet_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8f23d3-eb2e-492e-b114-690f92bee32e/napux.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/xabatimujorimatovugolave.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/pupojufesanuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c954019a-8954-4d9d-aff8-20f77d988fea/my_samsung_tv_will_not_connect_to_wifi.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_a9a276b7be7744d6bac4f7748d3eafcb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd8f44d-50e0-4234-a334-479769ea3d2f/duweronisaxurebexigepiser.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/vudukez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7ac1fc-23c5-44d2-ae70-db005a8377d5/72200305350.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 4744 bytes
SHA-256: cac0142a53f41134b7df333a1d5163758580d4fac71fd440873bba95c56270af
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10800 bytes
SHA-256: 7bd0fed5766cb9147b8666a2d79cd502318f80907ae029dd6d0adc30cbda8d50
font_02_sfnt_off00012890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12890 16792 bytes
SHA-256: 50767598ce16724d9290d5767e71dceacf9e2fec09beee6070b13211105d97e7

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