Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55745ef7221a29e…

MALICIOUS

PDF

84.8 KB Created: 2021-04-14 11:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2892780753fe902ec3ec22bc82820961 SHA-1: e867a4182050fe8f0b705b0362b5f33e734f5dbe SHA-256: e55745ef7221a29ea960d5a74a7a190700ce3178293d1708bcaa93e03beadfd8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites, aligning with spearphishing tactics.

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://kuzutuzo.ru/strik?utm_term=what+is+the+price+of+royal+enfield+standard+350 PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://bet-info.ru/how_to_install_xvid_codec_on_nvidia_shield9zzj8.pdfIn PDF document text
    • http://svarka-aurora.online/zebco_33_classic_for_salecchr9.pdfIn PDF document text
    • http://zubiki.top/xejogovigixefowigiteniyzgu5.pdfIn PDF document text
    • http://drovazvenigorod.ru/ms_word_templates49wwd.pdfIn PDF document text
    • http://wersita.space/arthur_aron_36_questions_listh8bct.pdfIn PDF document text
    • http://demask.space/48612444059y1dr8.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/dc1695a0-17c3-4435-9f44-ddc7f049becd/82734980761.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/restaurant_weekly_cleaning_schedule_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aba927c-9c2f-4af4-bac3-3b6eb88a0ad0/uscg_weight_probation.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/78278846480.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/apple_id_sign_in_on_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9bca5e-1e71-40dc-88f9-4958d1aca8be/78440507331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88c6136-acd9-49ae-bc9d-e02c38ca2722/46114763540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a79c1c9-2107-410c-b6b5-97b269f006e6/what_is_8000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6257ae-f83f-4094-a14b-2172d564864e/how_to_use_computer_mouse_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852085db-9949-4a0d-ac4e-06c4282b7900/80254048387.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/can_you_use_pack_n_play_as_bassinet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4e4573-b5d0-4dff-b76c-6971e258cd86/49103600917.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_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 5788 bytes
SHA-256: 903bee8d896615b8db14791d9c853ffd299f908cbfe20bc5aa784ceb1b6b594b
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 10868 bytes
SHA-256: 770346720fc652f8d9b690550da405587a630b89b93ea4c3080dc53bfd53a805
font_02_sfnt_off00012e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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