Malicious PDF — malware analysis report

Static analysis result for SHA-256 28137dd40cfd43a0…

MALICIOUS

PDF

73.1 KB Created: 2021-03-23 18:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 24c14d629a396bddaa22aaa2df3392af SHA-1: e5acd3a2e45fa7743af341cf9ee5b1b1ed60205c SHA-256: 28137dd40cfd43a0259b925aa01efa53fb003066c5cb6be2e954f422cd64b711
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 0.9997

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/strik?utm_term=how+to+play+modern+magic+maze PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413117/normal_5fffb9bd68242.pdfIn PDF document text
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/rupuji.pdfIn PDF document text
    • http://cosmosqrab.online/786365945051199p.pdfIn PDF document text
    • http://finansi-7.online/wutijefulupegorobavotb1ll8.pdfIn PDF document text
    • http://uscreditreport2021.info/its_not_the_stork_youtube466cl.pdfIn PDF document text
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/d3eb5b.pdfIn PDF document text
    • http://nowanedilado.22web.org/dipoledogugemunawe.pdfIn PDF document text
    • https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/tefuxuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_60348297cae83.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/musoxifuvitalo/28422321241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24024db-64dc-43ea-8f87-34ed84ae94ce/advantages_of_inbreeding.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/best_romantic_book_quotes_of_all_time.pdfIn PDF document text
    • http://zaposupi.epizy.com/89676222161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabf9945-00f7-4312-a9e8-ec7a1981b36b/how_to_uninstall_norton_on_mac_catalina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec5fda1-6e51-46d0-8e99-cf2494a61f8b/20323534751.pdfIn PDF document text
    • http://poduzaka.epizy.com/free_download_rapidex_spoken_english_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69aefaa3-bf1c-4200-9eb4-adb501c393ed/xupavusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42f2aef-107f-4999-ac56-0803f51892e0/what_is_the_story_the_landlady_about.pdfIn PDF document text
    • http://menoziduwuju.epizy.com/simile_examples_sentences.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/pirates_of_the_caribbean_piano_notes.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_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 5420 bytes
SHA-256: 5a2574387345d50661d49742a37447d1111f8072ce52a4e12a2a95d9fc688935
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 10752 bytes
SHA-256: 44f569dbcb0340861c3f6359447d671c4f5908b0845566b268069914f4e4ae1c

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