Malicious PDF — malware analysis report

Static analysis result for SHA-256 d557993d01952363…

MALICIOUS

PDF

85.6 KB Created: 2021-03-15 05:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5850002f7cce52ffd297a4ac40b51db4 SHA-1: a61e16286290cdd7f568eb785eaed66925e122b3 SHA-256: d557993d01952363651aaeee5f92b08866849979dcec847d6d3459c3a2c630f6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though garbled, suggests a lure related to PDF conversion tools, which is a common pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/award?keyword=ph%25E1%25BA%25A7n+m%25E1%25BB%2581m+chuy%25E1%25BB%2583n+pdf+sang+file+%25E1%25BA%25A3nh In PDF document text
    • http://kisiguvawatabom.22web.org/christmas_carol_sheet_music_for_bagpipes.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/jggc5ha/word_search_crossword_puzzle_maker.pdfIn PDF document text
    • http://letalaxaraxudum.iblogger.org/what_are_sentry_safes_made_of.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/TCpge3i/92418570291.pdfIn PDF document text
    • http://mosenub.22web.org/begoduvikobadorujuwedepo.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/dANhboY/27173019390.pdfIn PDF document text
    • http://lifeshop.pro/hunger_games_catching_fire_chapter_4_summary08xud.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/hgejiRD/jofunofo.pdfIn PDF document text
    • http://online-sistem.site/39771742239hdu4n.pdfIn PDF document text
    • http://gifozazupu.iblogger.org/48744211079.pdfIn PDF document text
    • http://discount50.pro/16096157873292yz.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/4ad9f45a-820e-4d11-b563-1871df74755e/33940454471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ddf677-a3b6-4f4a-881e-fc397317e4ab/93682612224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ced594-2c6b-426d-8225-12d26429c88f/zubavuvasalojoriwa.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/kogadetigemoxasuxug.pdfIn PDF document text
    • http://sulegezusaz.epizy.com/wonder_book_report_ideas.pdfIn PDF document text
    • http://dumatefofexulen.epizy.com/cisplatin_induced_nephrotoxicity.pdfIn PDF document text
    • http://pewubep.rf.gd/70723684799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dda61e2-bd20-473c-a9aa-e7839fd66443/tiximogat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627e5045-5af9-4a75-bec3-64784e2da2fe/will_trs_retirees_get_a_raise_in_2020.pdfIn PDF document text
    • http://xodupope.epizy.com/vefinako.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/national_geographic_magazine_free.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_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 6476 bytes
SHA-256: 818205cabb21a59c790132f5a4337977f06f7bf369b275b7504d419a0513bd4f
font_01_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 11052 bytes
SHA-256: 432ea4fa80bda46034b913cec5656284b39c4585c573c7aa075a6ee2477c444b
font_02_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8