Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ce44198a5dc572…

MALICIOUS

PDF

71.9 KB Created: 2021-04-01 22:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6a7e1c4a9f2a048118198c9199fd0a31 SHA-1: 8f93b8dbe26adfdf2dab30487480b9f62a4d2b4b SHA-256: 61ce44198a5dc572a909b80077723b172eddd8a529440782aff13d369c26ae2f
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 an embedded URI pointing to 'bologen.ru', which is flagged as suspicious. The PDF structure and embedded content suggest it's designed to redirect users to this external site, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of external URIs is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=is+a+gym+a+discourse+community+group PDF link annotation
    • https://cdn.sqhk.co/keviwebewuta/Slgdg2c/wokotenisimusanimen.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/Jgcijih/11204373126.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/HZINhes/riwupenonexewusotaponaju.pdfIn PDF document text
    • https://cdn.sqhk.co/vikeguzag/iauggig/canada_visa_family_information_form_signature.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/ib6iihS/49420031626.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/jhjc5X3/yellow_metal_bookshelf.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/6b3c78e1-d8ee-4ce8-87a2-a6e41fbe37a2/what_is_the_schedule_for_the_playoffs_tomorrow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4acb1a-c0a5-4da9-a8f5-45a4a69f85ec/disneyland_paris_park_map_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a2b1aa-02b0-4bfa-8c47-c4dacb11a871/58446856187.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_51c38267fd2847a3afc193a36fb0ab95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63ffbd4-3f50-4d47-a5c3-7db463591202/possessive_nouns_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d906e15-f8e1-469e-9772-8e4e66726c29/14970285252.pdfIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_27ba43d0a4dd4e1796e8cb283bc71352.pdf?index=trueIn PDF document text
    • http://vubelifijam.atwebpages.com/53192052817.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_9cc16aa4eaf641f6a023e93b1000a1e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b59ffc6-c87c-417e-981c-d85353dd3a2d/jugebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2835dcd5-6b27-452f-b766-a89d57b77aa2/cuantos_mililitros_equivale_un_centimetro_cubico.pdfIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/antibiotics_microbial_assay.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_b2abd1406e7446519afee5f3fd910dc6.pdf?index=trueIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_bf639abc3ceb49b2a3408bdee8730744.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 5400 bytes
SHA-256: b39609c45cfbaaab54c44be3f859d8ee3f801dded06d2828ed06de80043cdd0f
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 11060 bytes
SHA-256: 0871d254ba98ff87816dcc7612a0e9582373bb7fc479fe0c446e3b1e1df78ef8