Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d783046158e8698…

MALICIOUS

PDF

83.2 KB Created: 2021-03-14 08:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c6a39b3dcee37ac6529e3862ef968242 SHA-1: bfa0e491d2bfc485edcb35369f44f16038f748ff SHA-256: 8d783046158e869828dec796cffe25bf0fc9eca8eb80a181d554b3ace50e42d5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. ClamAV detection and ML classification indicate malicious intent, specifically identified as phishing or a trojan. The embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=garden+of+tranquility+quest+guide+osrs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5ffe9c9e60b06.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/36017094667.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/Ridvgdx/23998568492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392868/normal_5ff3b22be5e1a.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/figurative_language_dalam_puisi_the_road_not_taken.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/juzimolulifud.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/getichS/wd_my_cloud_home_duo_8tb_price.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/cjxQJgj/74387832665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495241/normal_6002b7aa557b4.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/vojotoxofamemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473052/normal_5febe19934a78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_b78f561144474cfabda9bb2e59104a52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2aeea0-02df-477e-973f-7a4d799c13de/skywalker_15_round_trampoline_pad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357a74e4-c711-4236-ab13-552c07178c93/22345826025.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_01f9da901df74223ac49fdc2e7f65551.pdf?index=trueIn PDF document text
    • http://vegubom.atwebpages.com/lonely_planet_japan_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30597469-c878-47d4-b9a5-1287a80cc299/korg_microkorg_xl_37-key_synthesizer_vocoder_with_expanded_pcm.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_cc9e8dd0fccc465aba6832c4f99d3420.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eed0711-ed27-451e-8491-70fba6dee658/how_to_replace_batteries_in_kwikset_smart_lock.pdfIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_62f17e9b346d4acfa2f569cdeead06ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb6e484-9b8e-460c-8120-aadde871057c/how_to_improve_my_anime_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438aa9c3-8b5c-4a6b-9896-1b33b8bdf09e/does_dash_diet_work_for_weight_loss.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_c11f1ac61bbb4e6ebbf52c887a09445d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89364574-58c0-4df3-a628-be75b0b1c049/my_whirlpool_washer_wont_drain_or_spin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1613850-6ac2-4f01-a213-f8cec125d0dc/47392912218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e636e83f-ced7-4ee0-990b-80df8dd9ac06/paint_dot_net_open_gif.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_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 5332 bytes
SHA-256: 4a89c25cb715fe88919750618a89a9e3be180825b5d51d9ef9e1603ac06e6bfc
font_01_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 10816 bytes
SHA-256: f0a4c4c573af5141cb2564967720c931c8b5d8c543f742665398da41f27172c3