Malicious PDF — malware analysis report

Static analysis result for SHA-256 59515bdfd1992b6f…

MALICIOUS

PDF

86.9 KB Created: 2021-04-30 03:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 36d59eabc278dcf5cb9f3e14e2596168 SHA-1: df7cfefb99de8554ee450f595f47959f146d6860 SHA-256: 59515bdfd1992b6f9b6751299b1c455da7fd4d5d3df4400123f429794285b0b9
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=forbidden+tabitha+suzuma+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461516/normal_602330546ff0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fee25202e169.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/nutenud.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/puvuvubisaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426085/normal_5fdf27183bc3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_603980254b86a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_605d20df05a0a.pdfIn PDF document text
    • http://maxirem.mygamesonline.org/vunazevotesiwewo.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/when_you_love_someone_lyrics_day6_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_602ae2806c3e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_60019d2033ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_6019115753039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_14f5e552995e45ce9a22bcf125ae8501.pdf?index=trueIn PDF document text
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_2da5435066c6496f826f88353041fe65.pdf?index=trueIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_67764476d945483b8cb4ff16017b437e.pdf?index=trueIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_2cb1e3b19d6c41dc9f137b5ea9a42add.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea92cf5d-b38b-4d1f-96e7-9f775925cf36/cfa_program_curriculum_level_2.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_b47b2eccc9944ac48c246c0fe3adbbe1.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_7aea704fc8ee43f59bda0502b5ff64fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b0dd1c-d193-41c4-9a21-f4a532f84368/agatha_christies_poirot_season_9_episode_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9251e5-7f45-48ef-a6a4-ba57f48d5732/kojivuwifisajuwolov.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_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 3392 bytes
SHA-256: 900d02ceba6c66a0ac2f37665efd2c58b29e3d549e5a2d05b89c37081b15d2e2
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 5280 bytes
SHA-256: f0aefed71034477300e8e6cecf2e36073008fe4b717aa0be459e5f7e839dfc21
font_02_sfnt_off00012899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12899 10452 bytes
SHA-256: cfc8d248a24e7152cbedf9d6c332fc33edbbcfe1f1340af263da6786b7a416aa