Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfff16077f29864…

MALICIOUS

PDF

80.1 KB Created: 2021-03-13 18:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe8e74f6a85ed9057671a21b92f2087c SHA-1: a375183506b40db724266fba6e9e6bd24c4f0123 SHA-256: 3cfff16077f298642a0773fb8a937e9fa43fc032df9515913e18b08e3af48707
164 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, with one specifically pointing to a URL associated with phishing. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of outbound links, suggesting an attempt to create a link farm or distribute malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/award?keyword=biological+classification+pdf+notes
    • http://zijixiteluwek.scienceontheweb.net/wigurasepet.pdf
    • http://folugomobok.getenjoyment.net/ms_project_2019_fr_mac.pdf
    • http://vuvefezod.iblogger.org/compound_sentences_worksheet.pdf
    • http://tafakiduwav.scienceontheweb.net/tesugekizebokojaxavazij.pdf
    • http://molipetofokeva.22web.org/leredeko.pdf
    • https://static.s123-cdn-static.com/uploads/4420013/normal_5fe06825ac9eb.pdf
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6031f06cee62b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muxozuvalubi/crucis_fatal_fake_combo_guide.pdf
    • http://defoxumaxu.rf.gd/how_to_get_auto_start_out_of_valet_mode.pdf
    • https://s3.amazonaws.com/vebenok/reportage_djihadiste_francais_la_part_du_monstre.pdf
    • https://s3.amazonaws.com/kijelopazekune/xofojagugitukogapupetipef.pdf
    • https://s3.amazonaws.com/tevomenil/lower_back_pain_and_sciatica_nice_guidelines.pdf
    • https://s3.amazonaws.com/kafises/nagoruz.pdf
    • https://s3.amazonaws.com/dazawojob/sozulazilu.pdf
    • https://s3.amazonaws.com/lekizopiloref/momifutebuko.pdf
    • https://s3.amazonaws.com/lewuli/gamijepuzepovaladilare.pdf
    • https://s3.amazonaws.com/wizitifowubux/33611515456.pdf
    • https://s3.amazonaws.com/zomuzigo/32652492230.pdf
    • http://biwewija.rf.gd/98179550536.pdf
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_7054d336e1064be78feff176eb0dac4f.pdf?index=true
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_31e0319283814efb854f4785b85f62ef.pdf?index=true
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_e82b411278ed40ae918d0f5bc8f11a08.pdf?index=true
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_23e90254c228498f9b6bc90c44597943.pdf?index=true
    • 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_off0000fc31.bin
7c8447afde9bd12fca452c3356e57788d1bf886bda7e2fc24a92fa326b649384		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 5276 bytes
font_01_sfnt_off00010e43.bin
877687d995fbc9f5152a7bca238d5530e8e8a16363458522f23f75f88c61db4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 10548 bytes

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