Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d67cef902b90743…

MALICIOUS

PDF

74.6 KB Created: 2021-03-17 09:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f6e7eb85ccafd19ef47efcdd360a3eb7 SHA-1: 1ead9a68ea121f5e3ea1d6c8357324b87f860050 SHA-256: 7d67cef902b9074373c09c273a67774433b5cd609b4dad278d58974354faf9b8
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URLs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links pointing to potentially malicious or spammy content. The presence of embedded URLs and the overall structure strongly suggest a phishing or scam attempt designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/123?utm_term=flying+games+apkpure PDF link annotation
    • https://cdn.sqhk.co/wepunajexiju/jdZifgj/mebunonirufevuz.pdfIn PDF document text
    • http://pofuvize.iblogger.org/80112244636.pdfIn PDF document text
    • http://wugulisagu.iblogger.org/wallpapers_hd_4k_android.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/airtrain_jfk_map.pdfIn PDF document text
    • https://wexisuteki.weebly.com/uploads/1/3/4/6/134616275/nopok.pdfIn PDF document text
    • http://mufubiguwejewif.22web.org/77273169797.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/7hgMrgg/classic_games_arcade_emulator.pdfIn PDF document text
    • http://biwejobezimije.22web.org/power_rule_derivative_worksheet_with_answers.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/bofakofesimolu.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/getiwuxulisepopes.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/jdjdTcY/online_multiplayer_games_unblocked_at_school.pdfIn PDF document text
    • http://getchambre.xyz/btd_battles_6._4_mod_apkne10a.pdfIn PDF document text
    • https://pajobozonojamu.weebly.com/uploads/1/3/3/9/133997184/516ba9928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewomegoka.epizy.com/dungeon_masters_guide_3.5.pdfIn PDF document text
    • http://fenubamijub.epizy.com/java_mustache_template_string.pdfIn PDF document text
    • http://fidobagasamos.epizy.com/cisco_packet_tracer_7._1_for_mac.pdfIn PDF document text
    • http://bigamutalunu.atwebpages.com/plaquetas_altas_en_perros.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/2677689071.pdfIn PDF document text
    • http://visowad.epizy.com/the_things_they_carried_movie_amazon.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_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 5260 bytes
SHA-256: 0e206f7128ef2bcb7676830a9fd60fd2c39aab53613531cd398aabfc8bea89ad
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 10780 bytes
SHA-256: 46c6b2fcd885bed4f31bae086a06bb62f117545b9c1b9b8131ec9ca39369ae16

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