Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f5a6336af1dbd1…

MALICIOUS

PDF

78.3 KB Created: 2021-06-01 04:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 09e7908d91ad8918604be4c3493f8b59 SHA-1: a8462a39e5fca142877a928d02ec6ea8a3455420 SHA-256: d2f5a6336af1dbd1811a5a403b259914ea5ee1d017a9efcda24e555f93f45c61
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-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://bologen.ru/123?utm_term=bpmn+2.+0+ebook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5ff870b021260.pdfIn PDF document text
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/2b3f568c.pdfIn PDF document text
    • https://sitixibabu.weebly.com/uploads/1/3/4/7/134749551/7103861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5fc7bde19114a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_603b7cd1d25d8.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/adaa905d-7a43-45ff-ad63-3bbc3c0e618c/tefupirexiforojig.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144423183/67756179230.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144437805/multiplication_tables_till_100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1077a438-4342-44e5-9479-3741784ac6be/harry_potter_book_night_competition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3d06df-e86a-43d0-b4c8-c8ffd80ed08b/ms_dhoni_full_movie_download_hd_720p.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/what_foods_are_low_in_fat_and_cholesterol.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144432594/mazuvomigavigawobon.pdfIn PDF document text
    • http://feteselulo.pbworks.com/f/86530291637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b0cc5d-fb34-4ac6-9edc-986a9be7f301/68487394186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5093a8d1-85e5-4a76-a0d5-2e0ce8ff19dc/53861036728.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/lapd_police_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25cfe31-c1cd-42f0-9ef1-b8603b90617f/when_backing_out_of_a_parking_space_you_should.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144435429/27096386903.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/8490268598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbac7dbb-5bc9-46b0-a76b-918d33e3eafa/ccnp_route_chapter_exam_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71fd019-f158-4030-9c51-f30c5bc8c94c/6096893302.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_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 4888 bytes
SHA-256: 27ae73efdd674ec9729ceae2bcd74a5726fc6cc3abcfbd8390434cab127ba932
font_01_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 11208 bytes
SHA-256: 28ccbc4a6089e7ddcb78fdfaa9df7390af72fe3c432de40887dc0abd7bfeccdf
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176