Malicious PDF — malware analysis report

Static analysis result for SHA-256 24131aa912ad3662…

MALICIOUS

PDF

78.2 KB Created: 2021-03-21 01:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5b58914726a3d581da27570148f4ec8b SHA-1: 0d1d0e337e60405ded182344e6194fac320889f1 SHA-256: 24131aa912ad3662509efd8a61419829e63dfe177f74ed49f16b09d2e4b21fd9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous embedded URLs, with the primary malicious URL being https://maypoin.ru/wix?keyword=assassin%2527s+creed+4+beginners+guide, disguised as a game guide. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=assassin%2527s+creed+4+beginners+guide PDF link annotation
    • http://kulibakux.iblogger.org/kazevuputumijepebapofaki.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/WPi0qgg/sql_database_fragmentation_report.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/gYuiegP/cara_beli_pulsa_listrik_melalui_bca_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/hi1Zivr/89121195692.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzilogabuwu/wgjkxge/64165543754.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5ffda7dd78a16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5ff32da97a5a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453108/normal_5fee29abb402d.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/5ce0beff-7e69-47be-94fa-ffa3f0747325/hp_laserjet_p1006_drivers_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad56bff-ce5a-4580-b91f-faecaefb1238/wuzubafe.pdfIn PDF document text
    • http://kixukad.epizy.com/aimersoft_video_converter_full.pdfIn PDF document text
    • http://fekobovovexi.epizy.com/sejemozalagega.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/15_minute_interval_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/logic_pro_x_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6e7360-66fd-4a1f-a126-846bdb40a3a1/vobisupomi.pdfIn PDF document text
    • http://lupewozer.rf.gd/own_the_day_own_your_life_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/english_arabic_dictionary_apk_full.pdfIn PDF document text
    • http://vububogux.epizy.com/odia_new_movie_song_video_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080d2438-77da-4bb4-9313-11878e3e2e21/69658486817.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/14893515369.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_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 5324 bytes
SHA-256: ca3ce18a51efd5627556ce51ae63903a72f92b4573408cdd61e4a42da0402fec
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10932 bytes
SHA-256: 53f863cb3625dfff2118933aeaffd68cddca2a2065d3511baf9b4c9e92f74af2

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