Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5b9d0efeb0e535…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 15:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c3cb4289e34f79447f5c725f41390343 SHA-1: b58404fd05be40b8a647b4843c33696952472d53 SHA-256: 9a5b9d0efeb0e535dcb943b176d4dd0cafb72eb3d523470a04ce686da5090531
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links. The presence of multiple disposable hosting domains further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=chapter+9+review+answers+health In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_601873328483e.pdfIn PDF document text
    • http://rutefozur.22web.org/bugajepipibesomalinuj.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/ghjfTw2/minesweeper_how_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/uG4Iggo/12_hour_mountain_bike_race_arizona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fdd66f6c7306.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/ehgQggU/pedumutos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_60158ca9a80c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizepojuduw.rf.gd/crossfit_named_workouts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6f6a0d-c1ab-490f-bae0-aed4af7ad8f3/7685778407.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/aishwarya_wagedo_sinhala_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce28b16-98d5-4835-a6c1-a051b806368a/94170241566.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/40498957303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342008dc-7f86-4c2c-8e24-e26434323b9e/what_do_palo_santo_sticks_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89c02f5-070e-4c1b-9c88-13da85197c95/what_battery_goes_in_my_mercedes_key_fob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4341a88b-9954-40b6-8ff8-1745195ca7ec/82341485197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01d8778-cea4-4a61-afeb-465972b89dfb/how_do_you_know_if_there_is_a_jump_discontinuity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8981db50-ab82-468a-a881-9c2cc0693250/vtech_cordless_phone_with_answering_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8674ab6e-6ff6-4114-ad62-a24638bc5783/evenflo_car_seat_with_base.pdfIn PDF document text
    • http://melumudinev.epizy.com/61449388589.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/google_cloud_print_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/who_was_the_first_person_to_view_the_walls_of_a_cell_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeaa7693-ab5e-4baa-b941-c2765fac64ca/xojivavirululemabikusabu.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/jakogiturolefumevuxunani.pdfIn PDF document text
    • http://tivusanezidiv.rf.gd/38345811307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461fc49a-1742-47eb-ac93-d671d51c9b4f/how_to_fix_an_igloo_ice_maker.pdfIn PDF document text
    • http://fejobizife.epizy.com/afdd_manual_test.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_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 5120 bytes
SHA-256: f02168fa7212162db3b520e7a33bb7eabf0fb9bbfb49b497f8f638a00bc39183
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 10212 bytes
SHA-256: 259a386214512b16fb750a2ba4a3863fb8288fec123ce956ccd2c67ff8ab2b97

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