Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f1584fa3e2fb20…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 18:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e543915bf388c6e165bc70d31872b3be SHA-1: c919d4c8aecae6c3357473190ad6188e8ea3082a SHA-256: d1f1584fa3e2fb20cc4c30c7b92b5326688994d0b4965dd71959b6b4c6057491
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO poisoning or phishing. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely used to deliver a secondary payload or redirect to a phishing site. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=declara%25C3%25A7%25C3%25A3o+imposto+de+renda+2019+ate+quando PDF link annotation
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/8580797.pdfIn PDF document text
    • https://redefanugolikiz.weebly.com/uploads/1/3/5/9/135975275/5801127.pdfIn PDF document text
    • http://letaraluzim.scienceontheweb.net/problem_solving_with_data_structures_and_algorithms_using_python.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/1848815.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/41590.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/426625.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/vavapekadoliti/2444674569.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/verbal_reasoning_gre_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f251be50-1b72-4f6f-9d62-2dbb6a8b76e5/best_medical_school_personal_statement_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c8b057-ec7b-456c-aea3-fda7bf3e932c/massey_ferguson_165_suitcase_weights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816f6ad6-0160-4ec9-9b93-8acbcf3d042a/omron_m3_intellisense_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac1a5f2-9959-44ea-8535-8f1e9125e75d/86890137852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99ec72a-4d28-4fb0-b2f1-27560ce097c6/devupozezoresis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f77530e-d648-4b05-9e81-614ed7d89a24/how_was_christianity_spread_in_europe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3499ac-82b4-475e-93fa-2df3ddb90f58/p90x_workout_routine_chest_shoulders_and_triceps.pdfIn PDF document text
    • http://puvapulugo.onlinewebshop.net/school_administration_and_management_sk_kochhar.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/83072807007.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/criminal_psychology_articles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ae921a-ae28-4ffd-87e7-3467b159b090/are_star_charts_different_during_different_times_of_the_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5319fdc-95c3-4197-93ce-ac3800df7627/97438210010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f335567-2330-488a-95a5-0607897df183/puketaroletukejekagox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a44c0b-41a3-466d-91f2-0bad4dd1fe2d/1550629277.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 6324 bytes
SHA-256: 7991ce75cfa38497444617980685af3b6fbff2000958f7868d433014394e72cf
font_01_sfnt_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 13032 bytes
SHA-256: 0357953383c26490fb314e7d127fe9aa3dacbb4792934867ce02ce364a0670c6

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