Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a7027f4e00fa32…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 14:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5dc94da1a89ab1aa6032caa537bb9cb7 SHA-1: 08b57ed3607d17cb79adf8dfe8ae9f27756866d6 SHA-256: a7a7027f4e00fa32e7a69cebcca99e42ba82f241c42ea4b501c94df8a051bb01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=how+to+measure+zero+shear+viscosity PDF link annotation
    • https://cdn.sqhk.co/salefudodid/irhlDjh/webile.pdfIn PDF document text
    • http://qlemelest.online/remstar_plus_m_series_manuali6elr.pdfIn PDF document text
    • http://christinaanddavid2019.com/xoxezirebobuxabebogejfqon.pdfIn PDF document text
    • http://istlan.space/miami_beach_police_reportssiku0.pdfIn PDF document text
    • https://cdn.sqhk.co/lutumodigi/jeigcia/smash_car_window_to_rescue_toy_dog.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/iCe53hh/rudalosakuworakojifi.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/jdfjdid/skyblock_tips_and_tricks_hypixel.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/geid0pi/facebook_local_events_wrong_city.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/y71UgcX/dagitatar.pdfIn PDF document text
    • http://repochka.site/what_is_a_grosgrain_ribbonxy8ki.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/4dgdegh/fantasy_name_generator_wood_elf.pdfIn PDF document text
    • http://ogranifruit.space/6666426757hfb1a.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/mi_planta_de_naranja_lima_caracteristicas_de_los_personajes.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/bojatitajedilew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7b8e4e-3c16-452d-86f1-d12869a18530/bemazutofevidav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1234e08c-f838-4b15-aff5-483c7d402783/windows_run_commands_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/42323442254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9dd1f7-33df-4f6e-88cb-591733b0ef36/xudutixulogaw.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/37228573334.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/what_to_feed_a_gluten_free_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b4ea3b-023e-4e0d-8f8c-19e4501d3f9a/vamogipebekal.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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 1608 bytes
SHA-256: d963653e4bc847ef04b1f5c81b4a0ada1ac42dfcff5c2b7b8a7335b6e4735699
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 5272 bytes
SHA-256: f19d25400e25da1af4d5eb56e526885e21958d7943c0e99b5271da7a4f2db5e2
font_02_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 11684 bytes
SHA-256: a8427e4ac6d1f5cd50e15fb9f4bbf074f24ff0da4ccfd2661e0774aa2ae21052

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