Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1635d2843b38896…

MALICIOUS

PDF

80.4 KB Created: 2021-02-28 03:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8e398393e8835947f848596f31d2ca7 SHA-1: 183c4d6edd22f1891365db18c47c416c8d43f80a SHA-256: e1635d2843b388964360b847808ba7cae87785f337a2122bced6afc3f187d0c6
124 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6742

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://golowaki.ru/award?keyword=write+an+equation+for+the+nth+term+of+the+given+geometric+sequence.+%25E2%2580%25935+%25E2%2580%259315+%25E2%2580%259345+...+a PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413225/normal_602d46d4bb88b.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/finilitutisesenewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_602945d3b317a.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/gezililik.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/quotes_from_ram_dass_be_here_now.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/how_to_use_a_rosary_chaplet.pdfIn PDF document text
    • https://cdn.sqhk.co/sedasolegov/vhsgdcK/mr._toilet_game_3d_model.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_600405c8b4132.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/dilezazizazowufo.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/g5Vgfic/music_player_equalizer_432_hertz_frequency_bands.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_601066f5bb36e.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/jifukifewetetur.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/how_to_update_ti-84_plus_ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunonam.atwebpages.com/43307987885.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/ipad_pathfinder_character_sheet_app.pdfIn 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_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 5788 bytes
SHA-256: 8cfbd85f70f9f2c8573b4b5c8517ca903757b3432e83cd334cb274e93b74dee1
font_01_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 11484 bytes
SHA-256: 194a6ce64f67407cfcd5bc79dcbb61f85a727d0ee67b9451495d4f9a664b0bb9