Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a510e94ca6b7587…

MALICIOUS

PDF

92.5 KB Created: 2021-03-18 18:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3eab259712eb304fd858ca4ebd110af6 SHA-1: 451ea33e463ae9bebf8131450a606f1938efc5d8 SHA-256: 8a510e94ca6b7587602097ab38c7949024565551716361fef6280953db1cc65a
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The heuristic 'SE_URGENCY_LURE' suggests the document content attempts to create a sense of urgency, a common tactic in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/strik?utm_term=dirt+devil+power+express+ud20120+belt PDF link annotation
    • http://novijixonusasu.mywebcommunity.org/arduino_uno_board_mounting_holes.pdfIn PDF document text
    • http://nubolats.xyz/chopsticks_2019_movievhur4.pdfIn PDF document text
    • http://dommasters.site/moodle_complete_tutorialg4zkk.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/browser_source_code_android_studio.pdfIn PDF document text
    • http://5coupon.info/dr_seuss_books_online_the_lorax1gqyg.pdfIn PDF document text
    • http://shop50off.info/medical_corps_army_salary35h77.pdfIn PDF document text
    • http://pshcomonhere.xyz/integrated_mathematics_2_volume_2_answers751my.pdfIn PDF document text
    • http://inertbhjbj.ru/kevolatuvejiwowomiroxafa787bo.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/89536674114.pdfIn PDF document text
    • http://torchqbfl.fun/mesezazunegopc2t2b.pdfIn PDF document text
    • http://sell-toclick.online/exact_path_answersbg82a.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/dhbiaXQ/muxuwujatasem.pdfIn PDF document text
    • http://24goodstore.site/toeic_reading_test_part_5j0osn.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/stack_on_gun_safe_instructions.pdfIn PDF document text
    • http://notdull-eng.online/organizational_behavior_global_edition_18th_edition_free_download324bd.pdfIn PDF document text
    • https://cdn.sqhk.co/vawerowosuw/6jeia78/mugufazononibapiwila.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/f2Mjfhe/74235211601.pdfIn PDF document text
    • http://idealica-italiauficiale.website/android_game_development_unitybvjwl.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/how_to_make_ergo_360_forward_facing.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/lullaby_piano_sheet_music_billy_joel.pdfIn PDF document text
    • http://5-euro.info/360785469974hsug.pdfIn PDF document text
    • http://subonus.ru/operating_system_not_found_vista6bun5.pdfIn PDF document text
    • http://smirno.life/nyc_doe_state_exam_dates_20208pgyb.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
    • http://gupatevefojip.myartsonline.com/92921610680.pdfIn PDF document text
    • http://kokegewabero.rf.gd/jhankaar_beats_movie_free.pdfIn PDF document text
    • http://nojimaduxonariz.rf.gd/33633931219.pdfIn PDF document text
    • http://zofududa.rf.gd/audi_car_symbol.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_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 5204 bytes
SHA-256: 4491cac654e7fa573d2847ebb800a2e8ec1486cd10a87fd14b2b407fe3602034
font_01_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 12236 bytes
SHA-256: 24be2d12440668c205bdbbafefcedc6e2942501bdfb7b56b68fd48fc6ace6b5f
font_02_sfnt_off000155eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e