Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0e8067b4b4c1c0…

MALICIOUS

PDF

76.8 KB Created: 2021-05-13 19:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0850f87f0547f57de0894c693a0589e8 SHA-1: c53c19fce4aa2635a23523276d8de361f36a8a03 SHA-256: cf0e8067b4b4c1c0206e3f3f56c74733b9d0db88a781a1ac128a9ea0fb9c4d6d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to be a lure related to a product release date, directing users to external sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://baarspo.ru/strik?utm_term=line+6+pod+go+release+date+australia PDF link annotation
    • http://fiwisud.getenjoyment.net/logically_fallacious.pdfIn PDF document text
    • http://www19216801.site/bonijokorevirofoj2i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ffd417adbbeb.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/bejimap.pdfIn PDF document text
    • http://useporte.xyz/what_is_the_best_beginner_coding_language3xjqy.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/6869196.pdfIn PDF document text
    • http://knitfqph.site/brand_image_design_definition0gq77.pdfIn PDF document text
    • https://zewelujipe.weebly.com/uploads/1/3/4/8/134846298/tizepudixorib.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/rijumozumamasaxatimimubo.pdfIn PDF document text
    • http://com-copyrighit.com/zisibezuteg3ksi.pdfIn PDF document text
    • http://b4shop.icu/zinuponoziwops3i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_602e6a39c77d0.pdfIn PDF document text
    • http://oneshops.space/52930249920616zr.pdfIn PDF document text
    • http://help-business-media.com/drivers_log_book_template_freean421.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/poviwi_xisisa_pener.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/rebedowun.pdfIn PDF document text
    • http://slamelina.website/nobisukomibuseniwuwiky29u.pdfIn PDF document text
    • http://counterman.ru/up_from_slavery_chapter_15_summaryknx43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9891fcbd-60c2-4b45-a4a9-c188dadcd057/lidutufalatev.pdfIn PDF document text
    • http://wusuposakatoxel.myartsonline.com/gululofemidagidulifuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fb8609-1f0c-4f9f-9770-fd59c043cfdf/easy_hindi_songs_to_play_on_guitar_tabs.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/43522351400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7fbae43-4e12-45cb-bff8-01edcb768e29/ziterilifew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10331ab-5427-4045-ab32-ef1194b09a11/jubefubugilefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440e3c00-4ccf-4fa2-bdde-582fd2d88090/83613811623.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 5104 bytes
SHA-256: cc3bbd1506747a33aa52fb83c2d118a4a3e5306d22a4cb29bb9582f580c9078a
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 10812 bytes
SHA-256: 9404fc74c000e3b159c45149f42d776351dacf654ac2ae10e4bb09906533087e
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230