Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a645bdc5369f2b…

MALICIOUS

PDF

74.5 KB Created: 2021-06-09 13:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85a170de313f2993c811eec017ef8d92 SHA-1: bda796892090a8c5ef8b803b533436ad24760cf0 SHA-256: a3a645bdc5369f2bc99c91f32c135e7c1bb8f8991fcc38cbb6f6d301ba142333
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://ketchas.ru/pbw?utm_term=best+town+hall+level+10+war+base PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375350/normal_604cef1c5b3b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490528/normal_5fd31815706c9.pdfIn PDF document text
    • https://tenaxolisus.weebly.com/uploads/1/3/4/6/134654195/3260566.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/b5dfd1a8e6.pdfIn PDF document text
    • https://kasuvimifimo.weebly.com/uploads/1/3/1/6/131637099/kipudebunejokugo.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/4586577.pdfIn PDF document text
    • https://fevuvewuvadudu.weebly.com/uploads/1/3/4/6/134650824/1322928.pdfIn PDF document text
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/vovigamuxitukoguxa.pdfIn PDF document text
    • https://domenadonasi.weebly.com/uploads/1/3/0/8/130874365/tifibused.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_60142cd077365.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
    • http://pevozowo.pbworks.com/f/ronevuxamejumesuzage.pdfIn PDF document text
    • http://katafuzum.pbworks.com/f/nofitipogu.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144591654/1969_chevy_c10_automatic_transmission.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/w/file/fetch/144932109/mufisigekonowatalemu.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/70245056680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7567812f-484e-4a14-95d4-6bde4096ff0a/fundamentals_of_general_organic_and_biological_chemistry_7th_edition_free.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/f/bovovilefam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964d6bf5-ced0-40bf-8367-1c3826023c46/75802391330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da1903d-830c-45c1-a1cc-24e2c19c6fde/can_you_make_sourdough_starter_with_bread_machine_yeast.pdfIn PDF document text
    • http://safopiluzaw.pbworks.com/w/file/fetch/144928287/mr_x_full_hd_movie_download_720p.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 5048 bytes
SHA-256: 4a909e99eabce4bbe7a494358c6ff892980cc8e446c2e930bc855c19f2b979a7
font_01_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 13420 bytes
SHA-256: ca7d3d594c164cd304b435494ab5e4eb2f08bfd3735afdc7fc76fa8b51cbd724
font_02_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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