Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cad6e87af280d1e…

MALICIOUS

PDF

79.6 KB Created: 2021-04-05 05:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aea51a6be38fdfa6ab758fe0a50df3ce SHA-1: 24dade7c1607d174938d9ca2472574f1b854a20f SHA-256: 3cad6e87af280d1e55c5190454d74a9a66ec219828c5e4ab69402d206c988292
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=making+all+things+new+david+powlison+pdf PDF link annotation
    • https://denudosija.weebly.com/uploads/1/3/4/0/134017010/1908395.pdfIn PDF document text
    • https://pafutidosuzov.weebly.com/uploads/1/3/5/9/135989867/5e0f0ca6b14d2b.pdfIn PDF document text
    • https://sinukunub.weebly.com/uploads/1/3/4/4/134431456/1197686.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/overleaf_latex_cheat_sheeter969.pdfIn PDF document text
    • https://pejoguroboxifuj.weebly.com/uploads/1/3/1/6/131637830/216137.pdfIn PDF document text
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/dukasitibari.pdfIn PDF document text
    • https://wozexofinudere.weebly.com/uploads/1/3/5/9/135984457/2703056.pdfIn PDF document text
    • http://dorugatutaxovi.scienceontheweb.net/90335931035.pdfIn PDF document text
    • http://sifamukuji.iblogger.org/good_night_images_in_marathi_hd.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/basic_addition_and_subtraction_worksheets.pdfIn PDF document text
    • http://umkatrade.ru/skyrim_ps3_mods_installieren_germanc8s7z.pdfIn PDF document text
    • http://familyit.info/nespresso_aeroccino_3_milk_frother_how_to_useeuarm.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/rajeb.pdfIn PDF document text
    • http://xikofav.iblogger.org/pamafazigamojisasasij.pdfIn PDF document text
    • http://bunutib.mywebcommunity.org/gapafigifiwipakemamaxu.pdfIn PDF document text
    • https://jajajijonox.weebly.com/uploads/1/3/1/4/131453539/vosunefubotason.pdfIn PDF document text
    • http://iciko.xyz/72867803675gk0ky.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/luborinizu/bekixavuvemawexilogalo.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/how_much_horsepower_does_a_jeep_cherokee_srt8_have.pdfIn PDF document text
    • http://viposesarob.rf.gd/asian_cup_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/what_happens_in_a_street_cat_named_bob.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/canon_eos_rebel_t7i_800d_for_dummies.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/java_ee_maven_tutorial_eclipse.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/playbook_barney_stinson.pdfIn PDF document text
    • http://selaxarizipa.rf.gd/lozezo.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_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 5428 bytes
SHA-256: 307c6f1b9f1a3df781451dcd46f0a83ea34a6b0467e736fd56b7b635c883e545
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 11592 bytes
SHA-256: 412c918c13b22d2d29d70921edd88183bb1f43539ed56a5103e16b054e482158