Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cff5bffcb3f8c0…

MALICIOUS

PDF

86.2 KB Created: 2021-03-25 22:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 09c20ab5a4f575d0d66b4c966a6595c0 SHA-1: 7138e34e8129ff5f5123dbb38b2e755d0b240291 SHA-256: b1cff5bffcb3f8c04e11c374b8fa62080fb1ef5c4581ea15640dc9e3a7b900dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9950

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://xajibur.ru/123?utm_term=bixolon+srp+350+plus+iii+treiber PDF link annotation
    • http://bowuvudofi.scienceontheweb.net/barron_s_ap_biology_book.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/hep1ljb/nikko_air_elite_115_calibration.pdfIn PDF document text
    • http://iciko.xyz/alpine_cde_133bt_microphonevww29.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/RggqqQU/endocarditis_guidelines_ppt.pdfIn PDF document text
    • http://mejemunovavas.iblogger.org/cuantos_ml_hay_en_un_cm_cubico.pdfIn PDF document text
    • http://ooovseanalizi.ru/learn_python_the_hard_way_drive2tz4l.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/3jdjbb2/android_media_player_mp4_example.pdfIn PDF document text
    • http://mantenancie.com/270704870664ovne.pdfIn PDF document text
    • http://study-english-05.site/ladiwirolewhwuas.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/putuxuvetuj.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/IgejhYj/33578442213.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/oy6K0hc/smart_watches_android.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/samsung_un46eh5300_not_connecting_to_wifi994vu.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://s3.amazonaws.com/fukepez/xowimusot.pdfIn PDF document text
    • http://famekemij.epizy.com/anestesia_local_malamed.pdfIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/visenapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47230fb-b0be-4e1a-a185-7cd22e6f1e56/how_to_trade_bitcoin_for_beginners.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/73181420981.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/pune_e_challan_app.pdfIn PDF document text
    • http://xagevudogitoti.epizy.com/joranigikesiteso.pdfIn PDF document text
    • http://patudesaruvob.atwebpages.com/negative_prefixes_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68a92cc-6898-4521-a304-32a56d4fd10d/how_to_update_garmin_nuvi_1490_maps_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/086ac592-8140-42e3-adfd-cf0b86130f2b/td_jakes_books_on_marriage.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/balkaniyum_tv_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b562fef8-869f-4595-bdc3-f313f053f138/lopitobu.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/budapest_club_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/legendary_animals_red_dead_redemption_2_guide.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_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 5172 bytes
SHA-256: 7853ffc72913fbcf01a7fa8db0293ee92b270f008ef864268c7dca6cfde04195
font_01_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 19144 bytes
SHA-256: f8c81b26b812c41140ecb48a22f7cce0b069693c9d412b7f1939b09349d74373
font_02_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34