Malicious PDF — malware analysis report

Static analysis result for SHA-256 2648a7e1fcca623c…

MALICIOUS

PDF

82.9 KB Created: 2021-05-20 18:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 99d668446d67a1ac2463134b0fcc700e SHA-1: c18ba436a9a2ade24f2b14f0a0b70fbfb96783db SHA-256: 2648a7e1fcca623c242ca94a4bbd4d50710535fa95d4f675d870e72d50f7e824
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 0.9970

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://pelibifir.ru/strik?utm_term=how+to+use+sage+smudge+sticks PDF link annotation
    • https://favotofuti.weebly.com/uploads/1/3/1/8/131871633/temigaxawate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481072/normal_5ff3a337ec21e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5ff4bb4339b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6048578aaf506.pdfIn PDF document text
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/fb2eff674bb9f2.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/3ff946b6.pdfIn PDF document text
    • https://jesomufufasak.weebly.com/uploads/1/3/1/8/131872286/01bf54d4e7c8d.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/800361.pdfIn PDF document text
    • https://femidizori.weebly.com/uploads/1/3/4/6/134684525/7c4e1341da19bd1.pdfIn PDF document text
    • https://tovujitirufozi.weebly.com/uploads/1/3/4/8/134853008/pokunewex-gosonugepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_5fe56d70f3a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_6044fe038acec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da96f52-6e35-445e-b6cf-b5ae362ac773/zujekamaxapakojukulixixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28b32c0-0a08-42e9-b0f9-4575dddf1566/tizoridokivejunuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791257f0-46ac-4f18-86d6-97583d6ee683/network_security_engineer_careers_bangalore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6b910b-8143-462e-b628-372a0738521d/90458219154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab1ee52-e745-47f7-b213-7e27f25ff70a/how_to_find_slope_intercept_form_of_a_line_with_two_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c88c83-3365-44fd-8961-fd336f047076/beautiful_creatures_2_movie_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/check_json_format_command_line.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/canteen_time_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c88fc2-b253-4b48-9180-c31e6e813e12/how_much_do_automotive_technicians_make_at_a_dealership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e86923-604c-46f2-96d7-96575eefab25/79571052155.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/12819747179.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/music_rompasso_angetenar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3a5e67-684b-48dc-8ce9-2c488f64d82e/what_is_the_best_investment_for_beginners_in_the_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd06b24-538c-4dbb-a25f-6c244334a0d2/pentair_easytouch_psl4.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_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 5248 bytes
SHA-256: 6f14c082fe7bbfe2ff55a7d1a80a68cdf78b8ae1435cce1c7db920a9c3fc486b
font_01_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 11000 bytes
SHA-256: 0844d626c4de07b907f22117f61ff9bd55bd4a563279c41828b0825c4bb54b21