Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c23c2e1ba83b4aa…

MALICIOUS

PDF

82.5 KB Created: 2021-04-21 20:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 63e17bc6f93cf2767c3391b33e87b2f7 SHA-1: 4cb819e00017151710ca3fa4102033a60d612da2 SHA-256: 7c23c2e1ba83b4aab4454c73e0410c5b081c86bd12ecd135f3f19384ef5965b9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=arris+nvg589+battery PDF link annotation
    • http://mobufuwiwid.medianewsonline.com/pofogov.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/hfggGhj/online_auctions_near_me_now.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/what_is_a_model_for_solving_problem_behavior.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/59056955851.pdfIn PDF document text
    • http://fopekoriw.sportsontheweb.net/boxing_defensive_techniques_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/ap98M1Q/sebejibe.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/S5Xhaif/7959011782.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/zjieDie/covid_wise_washington_state.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/kADAghD/wardrobe_sliding_door_handle_design.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://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_2570d0c5bcdf47ba964af02bafcd93fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/78876226660.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_3978a3c7ba9940a1ac00ac103b182b9f.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_edaefe06f11941cb8a06b45d17f2ac4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/geronimo_stilton_secret_agent_reading_level.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_a53942b8db284fbf804e302d0d068031.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_da43212481934b91ad9bc3895ae5f906.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_b6ce28ede9fd4bc782e90f7299a33006.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f253d066-25aa-4c1b-9336-398486afef5c/strengthsfinder_characteristics_list.pdfIn PDF document text
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_fb857db5e2e3413ebd5b14652bb3a3bb.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_68306ddf76ab4fe5bc696444a855a603.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe5c993-ed60-411a-bd42-f71cbfe23bbf/44877315543.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/57681464101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18f6a5a-0923-4a04-ab2e-ddf26d31d7d2/nojowux.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_4c307a9b84fa4b74b05155581dd42e31.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_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 5264 bytes
SHA-256: 1ded435fa178c7a095dc4d7fc130341f4761709c786b146dca02153e89ea169f
font_01_sfnt_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 11540 bytes
SHA-256: eedc13510ed244cd7098110d765f19aacb8ef4db8a4f712a94fc4932667f2915
font_02_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.