Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbde4b28b65555c1…

MALICIOUS

PDF

89.3 KB Created: 2021-05-17 01:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b078d1f613235507b67cdfbbee33c7d SHA-1: d98bff189030781206922c7a13c613adaf925b2f SHA-256: cbde4b28b65555c1dd69c665b002131d2cb06f31a10128bbb6dda1f5a670ebf0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure itself is used to host and distribute these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=best+definition+sexual+reproduction+in+plants
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5ff63a9e960be.pdf
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fcce3021df16.pdf
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5fc9aa7968325.pdf
    • https://cdn-cms.f-static.net/uploads/4491671/normal_60538dfc297c1.pdf
    • https://cdn.sqhk.co/kifavubivelo/egjhhia/3433878348.pdf
    • http://lejifip.sportsontheweb.net/38035187869.pdf
    • http://gekiwejal.scienceontheweb.net/63042009334.pdf
    • http://xasekijig.mypressonline.com/vilebipojupalisavagudek.pdf
    • http://sazinoz.mypressonline.com/bengali_book_file_download.pdf
    • https://cdn.sqhk.co/lituxopevuk/ijhicjd/72617267250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tisavan.onlinewebshop.net/breve_historia_del_nacionalismo_cataln.pdf
    • https://s3.amazonaws.com/kosipefojaw/avengers_endgame_movie_in_tamilrockers._ws.pdf
    • https://s3.amazonaws.com/donukadizolin/wavuxuluvarakiti.pdf
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_a4c0e5660cf14a59847c74198c03c399.pdf?index=true
    • https://s3.amazonaws.com/wakuzidi/79327097542.pdf
    • https://s3.amazonaws.com/zevutebulaworel/vampire_diaries_season_8_finale_synopsis.pdf
    • https://s3.amazonaws.com/jevedijadiki/kevuduveg.pdf
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_dbcc3e4c1fb549f78ec9864e6367b26d.pdf?index=true
    • https://s3.amazonaws.com/dowadotiju/reading_comprehension_5th_grade.pdf
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_cd07ea57d91f4859b0c0b7700eef5700.pdf?index=true
    • https://s3.amazonaws.com/wazagidonux/the_vampire_diaries_season_8_episode_10_watch_online_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120d7.bin
12b498ac2a6ec1f6614dae08de2f069e343e6dc0025b48ab943df31bca138980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 5264 bytes
font_01_sfnt_off000132d6.bin
a1238ebb6f2467a0065406b07654ee3e4b6d23cc15bc6ef30eb10c63c5d12cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 10732 bytes

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