Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d2dbc4cd0b4562…

MALICIOUS

PDF

76.4 KB Created: 2021-04-03 16:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6f0a5b5626ea885959e474dc5a5e694c SHA-1: db2b994194e12552f20e442ed834e5eefe84c44b SHA-256: d9d2dbc4cd0b4562b217f875da39df5694b4068b5cc7f43ae3838092431272e4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, indicating it is likely part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous URLs, including one with a 'strik' endpoint, points towards a malicious redirection or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=student%2527s+vegetarian+cookbook+for+dummies+pdf PDF link annotation
    • https://cdn.sqhk.co/ponesigis/cuicN4I/my_melody_wiki_fandom.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/mQ2PyOP/new_house_construction_cost_spreadsheet.pdfIn PDF document text
    • https://jefolujolu.weebly.com/uploads/1/3/6/0/136096950/3555a9bd1927a.pdfIn PDF document text
    • https://joguwezur.weebly.com/uploads/1/3/4/5/134500750/tegajofisivove_lakerufajo_soxuxakojilaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464863/normal_5ff81ceb063b8.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fhjshfn/1970_mustang_428_super_cobra_jet_engine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5fdb59af4fa63.pdfIn PDF document text
    • https://cdn.sqhk.co/lugenaru/dhf0hiN/65602742031.pdfIn PDF document text
    • https://rorujazikuje.weebly.com/uploads/1/3/1/3/131379225/xezolixuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_604b34c69b8dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459479/normal_5fe1ec0594f2c.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/9742870.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/jbBkSvA/word_collect_answers_level.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/202b7.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/710029a9-1e4d-45ab-9388-1b5e06e72d1e/honeywell_6160_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0343792c-20a7-49bd-bc97-c7ef53ea08db/74437438425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8127c790-c750-4a5b-a1b7-1a9148b990b2/how_to_set_temperature_of_haier_inverter_fridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c3a567-cba3-4c82-97d2-7735495da7bd/can_you_play_world_war_z_with_2_players.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_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 5844 bytes
SHA-256: cdb2e682f1ec61f1293e19f32d801526fd5ce3f12edcc97933dd77fef7d1208d
font_01_sfnt_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 11668 bytes
SHA-256: 189e446a55c75c036cdb5e9a3173c81c0506c160caed9067c0294c11d9f51f19

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