Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd01513ae5464b7…

MALICIOUS

PDF

86.0 KB Created: 2021-04-03 15:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 218ecd1fbeae9451e5d33a0c00399c9a SHA-1: f859ec02880dbce686fac78e65b979a83c03c52e SHA-256: 8cd01513ae5464b783b071da5132b1970a3bd5bde85f91f7718ed6ad1ad4ba97
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 0.9991

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://vilenefex.ru/award?keyword=d+d+beyond+character+sheet+pdf PDF link annotation
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/xisutabuse.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/best_convertible_car_seat_2020_safety.pdfIn PDF document text
    • http://kususupodaw.22web.org/wotubuxozonupugu.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/mezezo-nomevasive.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/cJjgjif/missile_trajectory_simulation.pdfIn PDF document text
    • https://xemexavowud.weebly.com/uploads/1/3/1/8/131857479/dufajiziganupix.pdfIn PDF document text
    • http://dejepuzalew.mygamesonline.org/typhoid_diet_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/gcghEge/digital_architecture_books_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gebijowokobe/Tp6chFB/20991968572.pdfIn PDF document text
    • http://3203epworthcres.com/how_do_you_write_a_narrative_essay_for_6th_grade117l1.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/z63hfhj/gravity_movie_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/haja4uy/roald_animal_crossing_new_horizons_gifts.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/ghPcRje/tonik.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/59985.pdfIn PDF document text
    • http://nat-fru.space/lubagefewovigetuniroee5tl.pdfIn PDF document text
    • https://cdn.sqhk.co/sixatowitur/eha8heF/internet_explorer_10_for_ipad.pdfIn PDF document text
    • http://prolac.ru/tovimugodeminevoxumuvodhbi5s.pdfIn PDF document text
    • http://2022god.com/jazelome853x7.pdfIn PDF document text
    • https://woxepiwojogu.weebly.com/uploads/1/3/4/0/134018306/2834713.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/Hgi0jg7/my_little_pony_discord_servers.pdfIn PDF document text
    • http://zazipirumipez.22web.org/mathematical_terms_glossary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gofekujapi.rf.gd/48136711354.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/barriers_to_curriculum_innovation_in_nigeria.pdfIn PDF document text
    • http://donekik.rf.gd/jobs_for_guardian_temperament.pdfIn PDF document text
    • http://xozoxazoku.epizy.com/19334723397.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_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 5452 bytes
SHA-256: 1230231e3b95f0f8764f944d8d6ef6932eabf2bbe3b6d79f793d8dafc374228c
font_01_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 10692 bytes
SHA-256: 6a170808cc9242de2b5d3b1e028c0b30f95966c5a424b2232281623d00b97369