Malicious PDF — malware analysis report

Static analysis result for SHA-256 248992dbc78b594b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 02:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 09b9cd0cf455d9e99c7c8b9fa8fecdba SHA-1: 66ebc86eba0ef6d44e580a8eb20e6aa04cfab547 SHA-256: 248992dbc78b594b9afb77cdb8533fe283f9a296e1bbf473bfb2bf5abb558f4d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, identified as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. The document body, though heavily obfuscated, contains keywords related to 'reliability test' and 'cronbach alpha pdf', suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/award?keyword=reliability+test+cronbach+alpha+pdf PDF link annotation
    • http://offthepdrs.com/rojisakapidugitegopikanm0wf.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/ahcIigt/hungry_dragon_richmond_menu.pdfIn PDF document text
    • http://rafale.store/tusalitajaxo4uedp.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/eihA8lB/optical_illusion_tattoo_patterns.pdfIn PDF document text
    • http://stroiline74.ru/blender_2._78_macmb0g9.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/ygfjif9/bts_world_game_2019_free.pdfIn PDF document text
    • http://hempmap.ru/1_m_cuantos_decimetros_tieneoyv6y.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/dyxjfid/vupedezokamurut.pdfIn PDF document text
    • http://hushseo.online/jai_ho_mp3_songs_free_downloadt4ckx.pdfIn PDF document text
    • http://prizinsta24.space/how_to_check_balance_on_metabank_card4x5iy.pdfIn PDF document text
    • http://natur-bio.space/83310961395s0y9z.pdfIn PDF document text
    • http://mrshadow.net/vozazirumasowozozonakixe7zoy.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/6f278c2f-1120-4455-b811-ad40b9c93820/dewalt_chop_saw_dust_collector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62f970d-a85e-4c26-b99c-68099b5e65ae/rurabotuweriturut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e539b960-25f5-4215-b763-1a5b0c612416/craftsman_1_2_hp_garage_door_opener_keypad_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007aa302-7c97-44c5-9105-9983a16f5503/kazuwiduzimarikodaber.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_2f0a256895f04aa7862486fed4406328.pdf?index=trueIn 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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 5492 bytes
SHA-256: def5a186659623c47c953144128c50ae6139b0c6305bf913fe3e5b33248bc373
font_01_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 11848 bytes
SHA-256: 40a1c5fe2004a8551cbae0ef751018555e43063b2244dd0469170c6d1363a40e

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