Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8291b83bb2a19cc…

MALICIOUS

PDF

78.0 KB Created: 2021-03-23 09:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9c664e64e7e52fd4b676e49cb9877811 SHA-1: 895373f8826eea89b0c472df79ee0b8d12bde552 SHA-256: d8291b83bb2a19ccf4aea7f108f93dc2bef7fac952d2ccbdc4092cd97002bd3a
184 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=sistema+politico+mexicano+definicion In PDF document text
    • http://static-start.top/past_passive_exercises7ah3s.pdfIn PDF document text
    • http://allieshouseofhope.com/33780251678pe71y.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/ieia6xf/pizuxifetinuzu.pdfIn PDF document text
    • http://golden-charm.ru/2021_toyota_camry_trd_v6_awdm66ig.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/a9Sgdhi/idle_streamer_hack_ios_download.pdfIn PDF document text
    • https://minedikatew.weebly.com/uploads/1/3/0/7/130739540/747a451d20.pdfIn PDF document text
    • https://mipigonegomef.weebly.com/uploads/1/3/0/8/130813466/3c74c2cad791.pdfIn PDF document text
    • http://tryici.xyz/anomalias_geneticas_na_especie_humanap7iik.pdfIn PDF document text
    • http://frukt.space/never_enough_piano_sheet_music_full_songleoq0.pdfIn PDF document text
    • http://andyhongdigital.com/medical_surgical_nursing_books_free_downloadlzix8.pdfIn PDF document text
    • http://zagafesujed.iblogger.org/48785553952.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/muxufimodakuxud-fusuxa.pdfIn PDF document text
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/2d4bbb7c8.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/aKjogeR/beginner_cross_stitch_kits_canada.pdfIn PDF document text
    • http://circulshtangcalip.website/jivejitugozagocy8z8.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/OY8hjif/kasuzemogosujipuzil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/lego_challenge_cards.pdfIn PDF document text
    • http://lejokadedemixo.rf.gd/bijective_mapping.pdfIn PDF document text
    • http://lopoxupalajimuv.rf.gd/how_to_list_the_directories_in_command_prompt.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/14735519594.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/5th_grade_math_practice_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/nulazakoxisi.pdfIn PDF document text
    • http://bajivuselome.epizy.com/definition_of_teamwork_in_the_workplace.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/bootstrap_angular_form_elements.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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 5376 bytes
SHA-256: d2e1aec69c2a01b537ae91244d09f13fbdb1e450fb1f09288841c3420cda27e9
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 9876 bytes
SHA-256: efc0475458c3e2923c5530583fc5038825f1750493f9d80a5d0e6cabfeed9f89

Open this report in the interactive analyzer, or submit your own file for analysis.