Malicious PDF — malware analysis report

Static analysis result for SHA-256 664933af24d810c5…

MALICIOUS

PDF

81.7 KB Created: 2021-04-24 03:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4ad0715eda099afc5c9e27206a901792 SHA-1: 26cef6e7a200cf4cd05f59d122f3c627b3e323c9 SHA-256: 664933af24d810c50e01fcf16ab0196fa0d0e0df58713d3f0e4702f8067c8c3e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://bologen.ru/strik?utm_term=what+is+the+irishman+movie+based+on PDF link annotation
    • http://wopexobow.mywebcommunity.org/medication_adherence_rating_scale.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/mixogatax.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/wowemipobonad.pdfIn PDF document text
    • http://jetinaxisodew.mypressonline.com/vaviwux.pdfIn PDF document text
    • https://vekazapez.weebly.com/uploads/1/3/4/6/134601327/vedodawojeparat_venoxad_xewevuxutozegap.pdfIn PDF document text
    • http://posebakuxosafod.getenjoyment.net/1930028179.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/47396.pdfIn PDF document text
    • https://befibexa.weebly.com/uploads/1/3/0/9/130969759/tawesaveterur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_86897e3e4fb14d298497fb6522de66e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/simple_retirement_letter_of_resignation_template.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_017d03700d384b0cb8f5c371978a3dd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/67133528864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe1b0a1-5af9-41bb-875c-b40b085e7c05/father_and_son_clothing_contact_number.pdfIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_0119af2ccc77425aa23471776d5fd27f.pdf?index=trueIn PDF document text
    • http://zorikeroz.onlinewebshop.net/antecedentes_historicos_de_la_democracia.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_45bdaff705c54c7bbe540c2a914db99c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/68983374082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb3f417-00e8-4f5b-8514-461331df1400/gamuwumusisowedebepez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec650038-9ac1-459f-91d4-2198373b3fd9/67307305537.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/68073691403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bfd5336-c7da-4ddb-bdf8-616c1aeb8fec/86625461113.pdfIn PDF document text
    • http://lopakesuzuw.atwebpages.com/kelomevawosaweg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c73a4e-4ec7-446c-a0c6-910ab97d3961/jebawefapisatesugaf.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/salunibodedigefuko.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_7fad0611968340f08bb91b0ff86643a1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 5036 bytes
SHA-256: 7378e3a3120346de63b6716e8cbfb9980563d5b011f54da849205c2a4026866b
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 10524 bytes
SHA-256: e3c9265f8fd767129bec6603eb4e0879e63a3e64a57182db188809aa08db73da
font_02_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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