Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b311d7969c3c2e4…

MALICIOUS

PDF

89.2 KB Created: 2021-03-30 22:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a2293649199afe6b65b1c19dd58d4751 SHA-1: e379ec832fde5cf31a7202de4fab8d6d7a905ed8 SHA-256: 3b311d7969c3c2e46e1e63adbfa9f1be8bf93354845baa37b005b882fea6f90a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://gimoguvi.ru/award?keyword=adobe+illustrator+design+pdf PDF link annotation
    • https://cdn.sqhk.co/pikikunifav/32hg9Tm/92985009870.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/hiijjhi/banjo_all_video_song.pdfIn PDF document text
    • http://service-hire.com/merlin_5_sezon_trke_dublajd8guc.pdfIn PDF document text
    • https://cdn.sqhk.co/gofejenizew/1idxifd/10k_variable_resistor_information.pdfIn PDF document text
    • http://topcreditscore.info/98303636864l3fre.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/pZojb1c/7259545889.pdfIn PDF document text
    • http://virona.org/idling_to_rule_the_gods_pet_guidexmpmm.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/samsung_xpress_m2825dw_laser_printerfcbw7.pdfIn PDF document text
    • http://ideal-it.fun/22718815966597ch.pdfIn PDF document text
    • https://cdn.sqhk.co/tifisizeliz/jeQXLmx/78625468220.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/gcicLUD/lakegizede.pdfIn PDF document text
    • http://sparzha.club/hungry_shark_evolution_map_on_firestickc146n.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/cMmUo9b/kill_bill_flute_ringtone_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_4da76b58f62e4cd1883284bfa0bd8791.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6968d0e2-dc38-4e52-af36-948b8035e204/como_ganar_amigos_e_influir_sobre_las_personas_descargar_gratis.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_66d1dc39a6fb439399310f7185d7ee54.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_165500d0de4a432697a1be47c9c8f7e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74dfbf04-5817-4d2a-a0f4-a6157eb2cf12/2010_camaro_ss_for_sale_california.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_a7493b2c48ca4a5aba2fd84092fbdc04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f38a5e-1230-461d-9c6b-1cf8a817e984/kiduwumovixitowonulesimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd308cbb-9608-491e-b154-8e5050a43911/ruqyah_shariah_mishary_rashid_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49e5fef-b19e-4474-900d-1512bb686acb/zimafogipegabexujaza.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_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 5220 bytes
SHA-256: 3cd438815e40af6df1c0e060393cdfa65314d6e40fa7b6446d23a9eb26352abb
font_01_sfnt_off000122fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FB 12092 bytes
SHA-256: a7fc735f70359da1fd57e0d28340099c9f17ad22328826d638e8d18a9794a1e7
font_02_sfnt_off00014967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14967 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f