Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33e230ba827ca26…

MALICIOUS

PDF

77.2 KB Created: 2021-05-01 20:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1fa60608a9aa997fac9c2b8b3318f924 SHA-1: d2e13eaee4d8aa16414ac70bacd8245210853bc6 SHA-256: f33e230ba827ca269803abdf825ca0f30095365c75f4c6c77c9c88277e2d874d
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The presence of URLs like 'https://ponafet.ru/strik?utm_term=truck+driver+simulator+ps4+release+date' suggests a lure to potentially malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=truck+driver+simulator+ps4+release+date PDF link annotation
    • http://dobewobezusisof.iblogger.org/anatomia_de_cuello_y_cabeza_para_odontologos.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/P1Wxkjf/48258299341.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/davepemir_viwikonafuwufi_baxofepafi_mezijilixovagi.pdfIn PDF document text
    • https://zujuwaxi.weebly.com/uploads/1/3/5/3/135307850/sibawag_bekoxinodovix_lozixamupedutek_katisif.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/ig8ghjg/yandex_money_usa.pdfIn PDF document text
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/3861690.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/Ihcjcii/ricky_carmichael_mx_school.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/regejime-mibulujuwoleb.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/5158333.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/ratabivubijab.pdfIn PDF document text
    • https://lowinuviposawip.weebly.com/uploads/1/3/4/6/134667304/8781100.pdfIn PDF document text
    • https://gilasagajeradek.weebly.com/uploads/1/3/4/6/134632792/7448312.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/561179f3-0ce6-40ca-bb77-1d7841cdcbdb/attack_on_titan_manga_season_4_manga.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_8425429aa8eb4aa6891f8400ab2ad67d.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_ceba14fcf37d47838f7c6795c8e77237.pdf?index=trueIn PDF document text
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_4ef101f710e445038de200885f4b1c65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9edd0e-c096-46c9-89fb-041e7c3a6ce7/36364942027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0cacda-d166-4832-a53e-deda710a7ac7/hp_pavilion_dv6-2130eg_technische_daten.pdfIn PDF document text
    • http://wisunomimat.epizy.com/british_journal_ophthalmology_case_reports.pdfIn PDF document text
    • http://koluriv.rf.gd/pedifotut.pdfIn PDF document text
    • http://denefarow.rf.gd/18478826584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80417baa-beb8-4cb7-bd3b-3964cf5020a1/how_to_care_diabetic_patient.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_5fa2892097774b739a478bd6d53d86a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c32efb7-65ee-46e6-bace-83f6f69749dd/algorithmic_trading_python_code.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_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5380 bytes
SHA-256: 6b65485db6b6ac264dc70204844f119a052d09381d0ffae6d834b07920961e61
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 10640 bytes
SHA-256: 4d85c101282b93e9ebec6e2382dc04324a1cce82e53d5956ed4c6f02170584e1

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