Malicious PDF — malware analysis report

Static analysis result for SHA-256 058cfb0257bce3e1…

MALICIOUS

PDF

67.1 KB Created: 2020-11-25 02:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4e84c6442f0d224497543ec8bd717c63 SHA-1: 90a91feb82a2c5e3a24094f17e087f8c92150d53 SHA-256: 058cfb0257bce3e18a37ea29e465c8bc34568834f7ff98afa15f103c62c65a98
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?utm_term=study+guide+ap+government In PDF document text
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/wujupaduwibuzesa.pdfIn PDF document text
    • https://resedofuza.weebly.com/uploads/1/3/4/5/134503764/dumeverozuzare_giwat_jigevelu.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/sewefowisef.pdfIn PDF document text
    • https://sokexuwog.weebly.com/uploads/1/3/4/3/134351495/b02533.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/kunula.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/8548352.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/jeponowon/angles_of_elevation_and_depression_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7eb944c-2a80-4868-81dc-9f0ee03a31bc/pemokano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2eb17b8-ea32-4548-9853-151c0b0b30a6/hypodense_lesion_ovary.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/tisejuxupopidapusipuvifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94d039b-e6da-4d01-a951-c155b52b1c89/46634117800.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/do_no_harm_documentary_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4c1ec3-62a2-4d15-9ffa-d628061171fe/4227964270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368cd775-9bf7-4ba1-b878-aaacae3bbcd2/99136630532.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/google_chrome_extension_store_protocol.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_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 5336 bytes
SHA-256: bd1d1844987d9963ae98641126b9788b2e7498562e46d371d37d7f74f8099980
font_01_sfnt_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 10188 bytes
SHA-256: d953d9e32933d0c1bc673fdf5e8cb99704f6a42104f727a6410a7dedfc0a47cb

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