Malicious PDF — malware analysis report

Static analysis result for SHA-256 52514406418f583b…

MALICIOUS

PDF

93.4 KB Created: 2021-03-14 14:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ebbbbe260ae2f2d874238904a425fcfa SHA-1: 2650df7063c4104906a676566becc5af425b3a2d SHA-256: 52514406418f583b4e198b98311cbfa7a06799b403b25ce286937672d2845883
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by both ML classification and ClamAV. It functions as a link farm, containing numerous external URIs, with a significant number pointing to disposable hosting. The primary purpose appears to be directing users to external content, potentially for phishing or SEO manipulation, rather than executing malicious code directly within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=what+companies+use+functional+organizational+structure PDF link annotation
    • http://tuduvodakep.mypressonline.com/filemaker_pro_16_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/sozasusu/ghj6ijT/depafepunapimub.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/O6hanwh/maritabitejariloli.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/vuzenipugowalujupur.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/lizebudexakaw.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/8314539.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/8783741.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/65022819013.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/94565648940.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/WUImia3/rivij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e22201d-9843-4bef-ae72-da72646869cd/xasav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ed3f7b-d7e1-43d8-8d55-91e750a288cf/83425164277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c01d74-04e9-4ba0-90df-b9f6dad7117c/72860693509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49f14fe-adb9-4d16-8a38-69f1260522cd/vezokuvejenolib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac26983-4dec-45ed-998f-8e88f008d6e2/machine_learning_or_artificial_intelligence_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d5aa2b-6c85-42d6-8f3c-e18fb1e05584/sulexoxiviwowuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67868ad-d0b6-4f60-8abc-05e13c3e4469/stock_market_trading_hours_tomorrow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc46b30-c60f-48e2-9a9a-2c4c76a8e5c4/plug_in_doorbell_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c28945d-d420-4a95-ba8a-ef2b314ebe62/diary_of_wimpy_kid_movie_dog_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9314612-a7d2-44e5-be9d-aa104398f1d3/the_sacrificial_egg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88212c98-42a4-4204-9f86-a3af4c0040ec/4919734139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0776283-b101-46f5-89e9-3c18db553a55/samsung_s9_release_date_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017cea8d-3a19-4918-bf6d-bcd09bf689c7/gadinuxixu.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_off00012e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 5492 bytes
SHA-256: 38dca437242edce7859cb5b74e99db8d1ee05455dfa40d73d9576499f01c555d
font_01_sfnt_off00014131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14131 10808 bytes
SHA-256: 7927d25f0d38736554c2e459baee6c143858215ca88446005d6ba4a0a7edb3d6