Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ffb162777faecf…

MALICIOUS

PDF

79.7 KB Created: 2021-04-06 18:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 938ddd507f7c162bbac81ac504e41d9a SHA-1: 288c240988e5b3e85f232042cddc17d885db01c4 SHA-256: a7ffb162777faecf408a0770c23e54ceafd880e0e0cc1d43fde90ca3cfe0eae3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to malicious content.

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
  • 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://pelibifir.ru/strik?utm_term=a+suitable+boy+cast+firoz PDF link annotation
    • http://bupetud.xyz/94594525347phd0u.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/vuguz4g20b.pdfIn PDF document text
    • http://dagavelowewinoj.iblogger.org/rakudelefonenisiverejoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/usUn7ia/dragon_warrior_monsters_gameshark_codes.pdfIn PDF document text
    • http://wacc-cat.org/how_much_should_you_pay_your_child_for_chorestsgdt.pdfIn PDF document text
    • http://www19216801.site/phrases_for_irish_essays_junior_cert503j3.pdfIn PDF document text
    • http://salearea.pro/how_to_turn_on_pairing_mode_on_onn_bluetooth_headphonesdnuvn.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/hjEPSje/soda_dungeon_2_chef_ingredients.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/3Sjcibj/28230124964.pdfIn PDF document text
    • http://jelelegukawox.22web.org/horse_riding_tales_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baxamudixilado.rf.gd/will_try_my_best_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187fa425-661e-4041-b528-c58f44abb0bb/38113365625.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/photo_background_changer_app_free.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_370c6d3b06c1487499cd3212f1747540.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2dd8050-b705-49bd-8f89-c0251e6cc45b/the_redemption_of_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eded9502-f7ba-456e-8a2f-6fb2468bc4dd/votijawodoxareke.pdfIn PDF document text
    • http://sufejijefivuvo.epizy.com/derudopatopulikuz.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/jump_rope_workout_for_beginners.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_525f1a7d0fe14e5684932523037ab4ff.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_357c1430f18d4a35b05def80e38a7971.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafc0314-30f9-48f5-8b5b-ba8bd03c82ad/no_central_or_peripheral_cyanosis.pdfIn PDF document text
    • http://rurodebijusidof.epizy.com/up_b._ed_syllabus_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1b892c-d0fd-44c0-b0a0-a0912a82db66/mafuwaboxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/ufc_strawweight_womens_champion_2019.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_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 5156 bytes
SHA-256: adab7db5a9cad26285986b70d494e46ecfcaa74891749a8b2a50f9cab4ec7de0
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 10848 bytes
SHA-256: 8b2e7e012dca8cfeb0511710d4aac123044e826a909fef1b8854c5cd2b0ad829