Malicious PDF — malware analysis report

Static analysis result for SHA-256 f637c6602f1ef610…

MALICIOUS

PDF

70.2 KB Created: 2021-04-30 04:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dad2821b27c66e321e731a58ff67f9d8 SHA-1: f16eea2a1592aabb94a088bfaf4d89f83794a87c SHA-256: f637c6602f1ef61034f47802e98fd2df74026410e028d5979ecef28f97970139
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of many external URIs and the overall detection profile points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+do+i+pair+my+blueparrott PDF link annotation
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/bimujadalosez.pdfIn PDF document text
    • http://50offstore.pro/sample_spreadsheet_for_budgetud99c.pdfIn PDF document text
    • http://mihetos.xyz/ab_doer_twist_scale_manualcenie.pdfIn PDF document text
    • http://crispyset.online/why_wont_my_ue_boom_pairqddzc.pdfIn PDF document text
    • http://muzojumovove.iblogger.org/toxoplasmosis_life_cycle.pdfIn PDF document text
    • http://bigops.fun/jawebigxrir.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/eRgeie0/narijidomegomi.pdfIn PDF document text
    • http://nicepics.xyz/cuanto_es_1_2_pulgada_en_milimetrosyn63z.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/1331552.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/lOGBmic/best_hex_wargames.pdfIn PDF document text
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/7965893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d4d83f-0ec1-4c17-ba99-9bda8925b0f8/mobesesebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e6d463-3ef2-4248-8906-6b05c63ecb08/how_to_dye_hair_evenly.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/29242001786.pdfIn PDF document text
    • http://nenilezum.epizy.com/70006573488.pdfIn PDF document text
    • http://kejiguwudo.epizy.com/how_to_install_my_roku_stick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f49ccd-9e78-42c1-9d38-77c819e90ee7/mulofipib.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/changer_sac_aspirateur_electrolux_silent_performer.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/50549023440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca84a9e-e75b-4a4c-b303-2a7d1c445c97/how_much_does_chick_fil_a_franchise_make.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_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 5220 bytes
SHA-256: 576cf05d448584edab8b0030c04fd77f9408ee6fe7d6514735c56af303dd35dd
font_01_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 10396 bytes
SHA-256: 26e354d11c2f3f1d3b971c63fa146b6fcde80dfd144dc11c97cec1c3bb219dc2

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