Malicious PDF — malware analysis report

Static analysis result for SHA-256 871a61b587c0e813…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 10:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e79587626b5f026a12b506a7a25779 SHA-1: b0038986e579d2f081b8ef11c16b434ac3756480 SHA-256: 871a61b587c0e813a35647532c6fdfd20894aaaa2ee1f9bb7dcd0b51f2645878
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to 'http://managerprogram.live/bafazezogerixorulowot699q4.pdf'. Another heuristic flags an invisible link to a suspicious domain, also pointing to the same URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8078

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://soxebez.ru/award?keyword=horse+racing+betting+systems+pdf
    • http://managerprogram.live/bafazezogerixorulowot699q4.pdf
    • https://static.s123-cdn-static.com/uploads/4419827/normal_5fed04b01bb5f.pdf
    • https://cdn-cms.f-static.net/uploads/4494432/normal_6014e3d40e025.pdf
    • http://lnstagramverifiedbadge-form.com/virgil_aeneid_book_1_literal_translationyfk1a.pdf
    • http://blockingscenery.com/7309179709uop9l.pdf
    • https://cdn-cms.f-static.net/uploads/4475995/normal_60352205ae9d5.pdf
    • http://discout.online/warehouse_administrator_jobs_near_meqhlb8.pdf
    • https://static.s123-cdn-static.com/uploads/4466140/normal_60072f115c9c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a2eed177-2571-47b6-baa1-0c6e69b06234/kamogubifogolezumanodipa.pdf
    • https://uploads.strikinglycdn.com/files/79b0f957-3506-4924-9012-eecdcdf57ed6/vukedisinemivejevexedix.pdf
    • https://uploads.strikinglycdn.com/files/986afc3b-aded-4934-93f3-0bab34c0927f/94812492904.pdf
    • https://s3.amazonaws.com/xupizewuxere/70243548695.pdf
    • https://s3.amazonaws.com/jaloto/mezitu.pdf
    • https://s3.amazonaws.com/fidobakipivogit/89881342037.pdf
    • https://s3.amazonaws.com/vabedafozo/telugu_movies_websites_names.pdf
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_8ee132dbba404a49969fa9e25a419585.pdf?index=true
    • https://s3.amazonaws.com/vaxebisapesi/celsius_and_fahrenheit_thermometer_worksheet.pdf
    • https://s3.amazonaws.com/gedesisumi/how_to_draw_lips_in_procreate.pdf
    • https://uploads.strikinglycdn.com/files/33928213-4726-43d5-b6e1-3b7d0f06d502/nuevo_libro_de_los_juegos_del_hambre_precio.pdf
    • https://s3.amazonaws.com/vebenok/o_butterfly_tamil_song_free.pdf
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_5a25f47c817441a0b99334caa9b28c6b.pdf?index=true
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_a826c10e7cbe4523afd1c5caf5bb8b8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19ff3f85-5104-4346-a9d4-ce1983c9c63e/lulogimomu.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_abf8a50bb6ee49e09f278253a57cea9a.pdf?index=true
    • https://s3.amazonaws.com/pusixa/61014870401.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb25.bin
905458e24b54eaf1222972c43ef170a79d2ef0ae754e4159151577fc6662334c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 5432 bytes
font_01_sfnt_off00010d86.bin
d3fa8a100acf43e345a654ca9ebf72fecfb0202e2ccf904bd69f90fb06813873		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 10944 bytes

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