Malicious PDF — malware analysis report

Static analysis result for SHA-256 001fbf6ce4a56c4c…

MALICIOUS

PDF

86.2 KB Created: 2021-04-03 04:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5fc2b3d9c619ded15402ddc7d7b666ef SHA-1: 2b9b5fd2e5e912d6b7d1c6073ab67e9636844ec1 SHA-256: 001fbf6ce4a56c4ce669c9e7dda28dae6abe09056a64b34fdf23c06c6577d3a2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=how+proust+can+change+your+life+not+a+novel+alain+de+botton PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465015/normal_602e39582e090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_6032779148b13.pdfIn PDF document text
    • http://megivisu.22web.org/pikojiwixijoxiwa.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/zijegoranufezifimomofod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_6027bba50d148.pdfIn PDF document text
    • http://tobaliwono.mygamesonline.org/arabic_calligraphy_styles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5fcdac96c5f0d.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/valotobatadesixigosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_5fe95516b8d2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_e76bdb5a091b4eb7ba60e5a6acf43e4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba6afa5-17dc-41c0-8d03-bf601df49780/watchman_nee_quotes.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_7bf328cdb3e34e3e8401442651b28c44.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_4c71f3cb2c6c4425a611df6a5ec2f4f3.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_102d02e4ad6b493083162b093ded2827.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_ca3ce211d7c84562b1ab0fa8a6792c71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a67f45-754d-4dcf-a3e6-f62986bab348/who_invented_the_telescope_and_microscope.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_78cf2caf202e4069b43b7a38bd6525be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf38a49-aa5f-4102-86ad-a5fbb23dedf0/kanutuzazojomeduxiwon.pdfIn PDF document text
    • http://jekopavopi.rf.gd/arabic_alphabet_tracing.pdfIn PDF document text
    • http://xebudulo.rf.gd/nukirijukadozofitudexux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2beace0a-0452-41d9-be51-0da74c956d00/wolf_of_wall_street_full_movie_watch_online_dailymotion.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_d63739b114e64b2997bdee1a393a6243.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae679ef-9270-4ece-bd7a-ecc32c77d935/fabudaxojunogagowegus.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_bec6cade20bd45a6a029ca5ec2a055d7.pdf?index=trueIn 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_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 5772 bytes
SHA-256: efdfb47ec0300cbd84caee59d357eabe391a04f7040213bb36d5881becd370ae
font_01_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 11660 bytes
SHA-256: 3c14bde26a8716993d761b00456ca05629dc3c7072018f9645d537f97621a26b