Malicious PDF — malware analysis report

Static analysis result for SHA-256 908c308a9165c1ee…

MALICIOUS

PDF

71.4 KB Created: 2021-03-16 07:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e5c8d1eb792c8b1c3c2a748182d12e70 SHA-1: 28389f5357ba88d7609a865c246c8a0a0e75fbdc SHA-256: 908c308a9165c1ee6f5e24447947208d6418d58682d9f235eaa8cc4aa7ebda1e
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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 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.
  • 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/award?keyword=la+institucion+imaginaria+de+la+sociedad+cornelius+castoriadis+libro+pdf In PDF document text
    • http://sawemawe.mywebcommunity.org/how_to_clean_aroma_rice_cooker.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/6128642.pdfIn PDF document text
    • https://digulowewuw.weebly.com/uploads/1/3/4/3/134363346/gebovonibotufefu.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/22403502427.pdfIn PDF document text
    • https://kiwemedorupa.weebly.com/uploads/1/3/4/4/134446537/zifunelozi.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/anti_subversion_law.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/ninobitufaxamed-wividavunivose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_43cc5d873c674d73b8c4a0d633e02d7b.pdf?index=trueIn PDF document text
    • http://vesedakowata.onlinewebshop.net/mewepenikokaxozejagi.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_2d5141c9f45a43ddbcdd071c4f802cf5.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_f9ac1c4fc9db4fabade80ee1b7bffca7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19880bc7-789b-475a-916c-d8951fa4c4a4/30902936925.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_b9160ca5b3964d729b70ad714d914b5a.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_bebc9af973dd474d889f5cdea45d67de.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_600c0cba51a54461beda107251edadf0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2218d3a9-1f51-4989-b634-eec56db1d90f/general_contractor_safety_policy.pdfIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_9646708acada43e793d5c9a8cfe1363b.pdf?index=trueIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_2aeeb38d379547f9b67e12047fd53499.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_f17b11f633104e4e864586b481e7fc9a.pdf?index=trueIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_7c5a2862a6df4c8f8a1b0be8b5fb73ed.pdf?index=trueIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/83829182841.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_1a175a563f0b41878945f5ed87b494f5.pdf?index=trueIn PDF document text
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_93928ee978f7486ca0e34ced2af63f9a.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_8e5069f0bfcd4d42856bc6c7c040b12f.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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 5556 bytes
SHA-256: 7be54a9b01240d9a997e3ca0e3d0673fb1644ab3627b70091da5093ab9508421
font_01_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 12204 bytes
SHA-256: 76139be166b74b726ae3f28fc937d6dc7dc83b5ecda71f47dbdabbcd08f3f2c2

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