Malicious PDF — malware analysis report

Static analysis result for SHA-256 563f8a563c9500b9…

MALICIOUS

PDF

97.1 KB Created: 2021-04-25 19:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6b5d7382ce2d551b99dfb3d5c081bfe7 SHA-1: 7463950885ca60f061338cbc016d39a77f395de2 SHA-256: 563f8a563c9500b943127fa2844ba7c040eca2929d43f46d875e8b43e6e4a193
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. The primary attack vector appears to be directing users to the malicious URL, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/strik?utm_term=divine+mercy+pics+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_603b5cc57aa25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_6054be959d226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369185/normal_5fd03290e44f9.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/mhaPxij/tuxojaditideluwagavi.pdfIn PDF document text
    • https://cdn.sqhk.co/mimizajig/jbTia3B/activesheet._protect_password_userinterfaceonly.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6a2755-2dca-42ef-85be-734a222dafa4/94541476180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53346449-897c-4c74-a0b0-bb4c307aa6ac/how_to_get_rid_of_acne_blemishes_and_scars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14051d87-334e-4da0-8221-83773e5394ef/hp_color_laserjet_cp1215_printer_price_in_india.pdfIn PDF document text
    • http://javolijokexike.epizy.com/what_to_say_to_your_niece_on_her_birthday.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/wixefemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd467d2e-bb0b-429f-a693-4fcd392c19ce/jet_diver_depth_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f474ea-b592-4fb2-b951-13e061037bbe/tom_clancys_jack_ryan_review_guardian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96df6930-b839-44d2-9f32-4bb0148263ff/is_crossfit_good_for_losing_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023c0a7c-5eec-4c07-af97-a7ca23a01642/how_do_you_clean_dr_brown_bottle_warmer.pdfIn PDF document text
    • http://tipewonapifaguf.epizy.com/french_grammar_lessons_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6ef32e-925f-4c0c-a0b7-37face21aa56/43145609772.pdfIn PDF document text
    • http://fusaxisedafi.rf.gd/ballade_no_4_chopin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e1adfb-3f0e-44fb-af2a-9393ada6ba1f/manual_de_primeros_auxilios_cruz_roja_mexicana_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/346204ed-b9e7-4871-8bca-bcc2aa7f961e/lagulomoxatejonumuvege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467f99a2-c96a-4b84-92c9-bceaa984eed4/the_spook_who_sat_by_the_door_book_summary.pdfIn PDF document text
    • http://xujalupa.epizy.com/capital_iq_office_plugin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 5472 bytes
SHA-256: 26370a8636b16ecd9c0f9126cb408b8d37e4d58c5ec921ac1ea3e88411b0e12d
font_01_sfnt_off00013b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 11100 bytes
SHA-256: 0cbfef167af0d081bb35dbab1a054961e4f0401039e5b7dfd9ca25ce94599644
font_02_sfnt_off000161a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A4 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501