Malicious PDF — malware analysis report

Static analysis result for SHA-256 a520af35c6782f5d…

MALICIOUS

PDF

85.4 KB Created: 2021-03-11 04:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 87a59364f616a44c4be9cd32ffff12d8 SHA-1: 520a9be26878cc4a9cf3ca7d0a304796485a508c SHA-256: a520af35c6782f5d824f0bf1b2ec0cb92434086a499131702ec4f9a5703c442b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded URLs that lead to a link farm hosted on disposable domains, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', which are tools that can be used to generate PDFs, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=set+based+design PDF link annotation
    • http://suxoxaxowigab.scienceontheweb.net/scalability_in_cloud_computing.pdfIn PDF document text
    • http://werojati.getenjoyment.net/betavamor.pdfIn PDF document text
    • http://iciko.xyz/2020_acer_chromebook_315_15.6_fhd_laptop_computer8iv5g.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/wenaruvadufifofijuzuxadav.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/73023547605.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/bijejeta.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/240374729003z23y.pdfIn PDF document text
    • http://wisecredit.info/pacific_fitness_zuma_exercise_chartzke4l.pdfIn PDF document text
    • http://evatopshop.xyz/40159843726m2xh3.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/f6342d88-0a0c-42b6-a696-f77262574b02/jalusufesar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939b73a6-05c1-466a-a09a-3168e033c658/susopatiwipag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636fe29b-e7ef-45a7-9ed6-cab6e0729149/75308115729.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/cisco_4742hdc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817c99b4-c6ba-4bfe-8967-db55d21b24d4/fefatojukafa.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/dewipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0752c4aa-7208-4f91-b801-c2378c98a4e7/futup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a6689e-669a-42a4-abd0-7ff3c0d903fa/dodimobusaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56de113-7743-49ec-8f09-0ac2a4a4a7d0/sony_a3000_video_quality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca41730-5983-4939-bb81-540055bb99de/berub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a0b33d-d3ff-4cf8-ab72-4313b0fe4993/77237976278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b79a9e-b85d-4d19-aa4e-ded134b1f0af/how_to_reset_your_culligan_water_softener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6644b9-a908-4453-8977-d88ba1ed37a0/tevuzuxapefobo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 5108 bytes
SHA-256: bc59313304f8c498ef15ccc528cd1b96258a64b05caaec4a83c872a25f680da6
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 10360 bytes
SHA-256: 97abbb3d7430cf9ad919e61bcb28071b9382fc499549ad0712fe99bf4753c6ba
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 16952 bytes
SHA-256: 57b760207d422cc24be38be4b3b4db8f3ad3b944045c1d69b8f8f78a38d42946