Malicious PDF — malware analysis report

Static analysis result for SHA-256 4648eb1baa8a0201…

MALICIOUS

PDF

77.8 KB Created: 2021-05-14 11:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 88d57de237c8799013e2f210a5bbbd19 SHA-1: 9ae48d22f7735ace2f75f3a951e7320949cc959e SHA-256: 4648eb1baa8a02013bd1f65ddcae958cad816cc4b6301c2d18783d1478e27d4f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=how+to+put+thread+in+singer+simple+sewing+machine PDF link annotation
    • https://wazefiwef.weebly.com/uploads/1/3/4/3/134369298/wixamit-fofodim-napowaregim.pdfIn PDF document text
    • https://xojajulu.weebly.com/uploads/1/3/1/3/131382271/vuloxap.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/fipatusizenewikezepi.pdfIn PDF document text
    • http://santaparker.store/wapakapatavudipidabes6xf2g.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/autopilot_mode_technology_in_vehicles.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/17a8acd41.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/24592664629.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/69830225094.pdfIn PDF document text
    • https://woxexawunum.weebly.com/uploads/1/3/0/7/130776255/nurun_wisabopepezam.pdfIn PDF document text
    • http://jakor.pro/strawweight_boxing_weighttb4rm.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/pokipivakupugen_golaso_nivilote_legivuga.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/9b9ece0c-d243-4b10-aa72-41082f5044bf/51933554323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed24460d-93ff-4ff0-8ba1-1dd99fdba6fe/2005_yamaha_yfz_450_carb_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614c5401-b1ef-4f02-82ef-149526e42d4e/noforipotuvavi.pdfIn PDF document text
    • http://lenofafezanobu.atwebpages.com/ditebosasuferijir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc89476-a356-4697-b898-fa29e8931b9e/taotao_150cc_scooter_exhaust.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db50c30-1c43-4b3e-8bb5-c1e1db77b95f/what_are_the_female_saints_names.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/mulebikujefobukitudagepuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd8cde3-39ea-490b-8b43-8df09be1f013/the_12_steps_of_recovery.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_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 5540 bytes
SHA-256: 46e709143a97ba02cb9a37091867a1d9a4a4cf3bc81c9716d64327f435785d24
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 10712 bytes
SHA-256: c2647903c865fecb2c794f48d0d8a410628cb3c84f5b95cdd45d0f88a1a68ce9