Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48c869ba2ff0063…

MALICIOUS

PDF

90.9 KB Created: 2021-04-05 19:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0fe8b9bea78eaf7af56b85fe770136a5 SHA-1: b8866ef3173aeaf16140d81d1cb26fc352f6d9cd SHA-256: a48c869ba2ff00632103cc1bad2e83175f7d60f18b527303c434286f6f86d365
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 0.9980

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
  • 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://crophysi.ru/award?keyword=sensor+ultrasonic+hc+sr04+datasheet+espa%25C3%25B1ol+pdf PDF link annotation
    • http://ig-socialmedia.xyz/how_to_read_fingerpicking_patterns_guitari61oq.pdfIn PDF document text
    • http://esclub.info/what_makes_a_effective_thesis_statementk6kju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459470/normal_5fe2737b91248.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/Pk9hhaI/super_ost_retro_arcade_game_download.pdfIn PDF document text
    • http://autobaff.xyz/chris_bryants_ccnp_switch_300-115_solviy.pdfIn PDF document text
    • https://cdn.sqhk.co/zavipudajose/haCNgDY/73680039968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_6022340625c43.pdfIn PDF document text
    • http://maturibcgj.space/super_mario_odyssey_bonus_travelers_guide6ikmu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_600f8dfc9fbc5.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/gj6jejf/wyze_camera_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hiJuNA8/30670740918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5ff63107381af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412394/normal_5ff1870abd3ae.pdfIn PDF document text
    • http://deflecfcvy.best/thanksgiving_worksheets_for_5th_gradelwumn.pdfIn PDF document text
    • http://kersita.space/90528938501ro1fc.pdfIn PDF document text
    • https://cdn.sqhk.co/nuponoviva/FhbAKOJ/zewikunusemer.pdfIn PDF document text
    • http://themarkuzmusic.com/kafasalu03i3y.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/80284862730.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://uploads.strikinglycdn.com/files/9abe85c2-62e8-4f2f-87ad-5dcf4c433e43/best_short_stories_in_english_by_indian_authors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2567dc-168c-4594-b1b1-50152e91c11b/63903545188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78b381a-36bd-46a9-ba97-4444826fd791/dell_precision_t1700_sff_review.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/puzoditedelil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b25441c-d90a-4cf5-8b47-edaf37cba7bc/28602579486.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 4324 bytes
SHA-256: 4f21566362a00b801ccf6c2cc412856aa7c4a3d68209bdf0d706e31e5e87bf4f
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 5668 bytes
SHA-256: e37f0389eb35147053cb8b70255cdfa6adcce7ef0ce4e298df5e464c67187161
font_02_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 12348 bytes
SHA-256: 2466a2efbc0a655e85ce8e878cbba6a551f87703ac4c502ca935c5a8f50bf7ab
font_03_sfnt_off00013745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13745 16232 bytes
SHA-256: 518caaef23ff38dffd173390deb2ebbf4fc7588f1930709da0bf1b0df588cfea
font_04_sfnt_off00014ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f