Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f358e4b8c81e45d…

MALICIOUS

PDF

71.2 KB Created: 2021-03-07 02:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b2a1fab9aa13a39244f9f774109eca77 SHA-1: 9bcb7de2795c197338e9d91be4655c568e36d74a SHA-256: 5f358e4b8c81e45dd2aa74a21f595829e2aff903e2061fe6386837c85d1f196c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://dafemum.ru/wix?keyword=charles+darwin+and+the+tree+of+life+worksheet+pdf'. The document's structure and numerous links suggest it is designed to act as a link farm, likely to distribute further malicious content or phish for credentials. The ML classifier also strongly indicated maliciousness.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=charles+darwin+and+the+tree+of+life+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_600c5f98205a2.pdfIn PDF document text
    • https://cdn.sqhk.co/tawavumazo/dgjijje/woodworking_for_beginners_course.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_601786da71bd2.pdfIn PDF document text
    • http://vinadulateg.22web.org/weber_grill_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/benadujeju/ZjijiWU/night_walkers_and_mystery_mongers_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/cjaYgij/kick_buttowski_moto_rush_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_6038f533e94cb.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/ojbaMii/love_story_by_taylor_swift_karaoke.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/rjejhgc/8570611940.pdfIn PDF document text
    • http://riniwovefaraw.22web.org/wallpaper_anime_android_720x1280.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/gdSWggs/toca_builders_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fec0c15ef6e5.pdfIn PDF document text
    • https://cdn.sqhk.co/darekomeguv/5OGr04L/ww2_strategy_commander_conquer_frontline_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nujekezitifi/phhbhbW/general_sniper_age.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501495/normal_603e621220f0a.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/4UhcieW/neighbors_place_restaurant.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jorunodup.rf.gd/nixotibonalilux.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/dogimadud.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/19843103850.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/92422344066.pdfIn PDF document text
    • http://lokimutopilar.epizy.com/cheb_khaled_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/anahita_s_woven_riddle.pdfIn PDF document text
    • http://kaxanelasomitov.rf.gd/rogers_diffusion_of_innovation_theory_2003.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 5188 bytes
SHA-256: cc47835c137643d0f4f29ac3a68d8842ee2da63e10b99e8f8a705c2ee3c7e6eb
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 10168 bytes
SHA-256: d2bce8303640825034ef867d79d410a5278dce6c3d2a83dd55dac5cc0f92458f