Malicious PDF — malware analysis report

Static analysis result for SHA-256 479f16765bcb5d54…

MALICIOUS

PDF

89.6 KB Created: 2021-04-15 05:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8cf7ebae1250b389b21c0d4c5db060e SHA-1: e21d343c48040c7deb069a56f98a0f8de6fe6358 SHA-256: 479f16765bcb5d54f4cb02d1fbf4d1339c5cd3f4c7bcb765e3e7c5fd8001411c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=fight+club+2b2t PDF link annotation
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/barinolomup-koximosarut-megeda-jetoj.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/5012579.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/3898897.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/gjdI4hg/joxepowaxa.pdfIn PDF document text
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/4865620.pdfIn PDF document text
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/figajidiseg_sobipomosoxir.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/ibkOiiT/fawoludab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_3af5a96397594529aa9ecbcf745781be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4791d0-5782-4dd3-9d8c-d243dcbae735/86613457909.pdfIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_ae3fb0c49b8647a8bbc90350a7d2d34b.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_9e2ff824285341c9a02615474f6237b4.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_26b256366bca47aca3a32a041ca7cfe0.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_bf2321ad1ceb497294cc59e5542532e1.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_7d656bc171e8471685cfc250a2e47082.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3bf869d-5280-4d87-bc18-246882ee1a49/why_is_my_hp_printer_printing_blurry_text.pdfIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_a0383125d950488eadfbcad3b15de0f0.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_13e5f28533a743adb90146c16ccfd9e9.pdf?index=trueIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_1607f78a9724447185ba5bd4c57b948c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e89136-466b-4d37-86e7-8e29d490be30/72603284724.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_7c5a5b06d34c41c28af87524ebf23a10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f06e28-f199-445a-9b33-3bf98d5dd031/kenmore_over_the_range_microwave_light_bulb_replacement.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_5be8721fd2124d729cc52fba31c442b5.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_b0f6f68dd46d44efb43e6ace3d445295.pdf?index=trueIn PDF document text
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_76d2e919a4044d18a3d0628cf8445cc6.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_53b8415af5124c5fa196fc27787fec56.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_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 4804 bytes
SHA-256: f65d639070fd59414b7618969bc54718e462874443938fcf44d5f21f1adf6bbb
font_01_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 11396 bytes
SHA-256: fd163286c4910408ee33235d820eced82320a9e02f8626a7eb55195685766095

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