Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da741907a9042cd…

MALICIOUS

PDF

82.1 KB Created: 2021-04-25 01:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79efba068b8babcd156cb5631e87774b SHA-1: 72ed76fc459d9d8cbb6ff284952a38bd4a46e34c SHA-256: 6da741907a9042cd80d68ef9f752810f45dfe6d812cc3f40b1b44912acbf5d34
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=basic+physics+interview+questions+pdf PDF link annotation
    • https://cdn.sqhk.co/sifalavuxozo/gjfoWhe/gafimuzidewiwebaxovavom.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/fJPhfdO/fox_business_news_radio_live_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/hT6jbhb/kuboda.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/22235482054.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/tTjcyij/genokaralabomijuvijovojo.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/adobe_reader_windows_7_64_bit_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wumerelup/KhfHMWG/exploration_mtg_borderless.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/ath59je/dig_deep_volleyball_tryout_results.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/igim3ei/emergency_room_cost_for_chest_pain.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/jdgfo39/the_sure_shot_lyrics_gang_starr.pdfIn PDF document text
    • https://demepeli.weebly.com/uploads/1/3/4/6/134632839/napewigexob.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/gihbYdA/detogisasavadozuruk.pdfIn PDF document text
    • https://sulefufevonabu.weebly.com/uploads/1/3/4/3/134363738/7986510.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/8638053.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://uploads.strikinglycdn.com/files/ab38bf2d-46d3-4028-ba33-86cfe2b6afac/yamaha_av_receiver_rx-v571_manual.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_607221637f614a22b4e457aff370eb2e.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_543330c1ea1f4b50b0df978a3008a53c.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_fc1527828cef45e994d1b44a44367099.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab56e23-c19e-4aac-82fe-22f89e0cd009/99078555204.pdfIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_fe696775208640cbabb3d783ac36653e.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_e794b19e84474fa6808f80085e5ec10b.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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 5520 bytes
SHA-256: e291da32de18f0e80d4757e661c56fd88336f55c1abc29dca70ee82236337635
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 11360 bytes
SHA-256: 5f928169abe60619a4343cbb9639235c08b164eb0f419254af7752d5c5431a86
font_02_sfnt_off00012d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D07 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3