Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19055c7ba0891f1…

MALICIOUS

PDF

86.5 KB Created: 2021-03-19 21:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 89e2f737beef12aa499a3549e50b401c SHA-1: 9d63c9b8c06ec027b14424a31f7ad33832dc67a1 SHA-256: c19055c7ba0891f1d264dd16b787f29437b2f0f78333142efdd399d1397c81cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://dafemum.ru/strik?utm_term=sas+ods+excel+proc+print+column+width PDF link annotation
    • https://cdn.sqhk.co/guzoladip/d4jco3r/56612090299.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/hfhagci/arturia_keystep_pro_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/zqhilgh/nobevezuxopiw.pdfIn PDF document text
    • https://cdn.sqhk.co/dujepiwewi/7jgccVd/xulezilawugisi.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/idGNjdc/gazeruwetuxatidamane.pdfIn PDF document text
    • https://cdn.sqhk.co/vivupedasez/YFgjfhd/xewowaxusasorexulolofozim.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/idaOVhj/84836216840.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/lhdJTgc/gmail_inbox_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/hjzJcgc/coin_crack_apk_download.pdfIn PDF document text
    • http://zufutefej.22web.org/90383751616.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxelokukobarij.rf.gd/do_portable_dvd_players_have_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b50b8c2-a81c-456f-9202-03a9ab3f2b9c/five_nights_at_freddys_game_free_online_scratch.pdfIn PDF document text
    • http://xonefepuvimami.epizy.com/trumpet_euphonium_duet_sheet_music.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/premier_nutrition_shakes_walmart.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/college_of_glamour_5e_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fdfa3b6-6948-4759-979a-51a1ffb3d172/what_are_legacy_forms_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c73466-082f-4ccc-930d-e84ca0c0b5dc/834296418.pdfIn PDF document text
    • http://bexexakik.myartsonline.com/encyclopedia_britannica_eleventh_edition.pdfIn PDF document text
    • http://selawed.rf.gd/liquid_carburizing_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90aa2226-762c-4be4-98f6-626966c80917/barska_biometric_safe_manual.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_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 5576 bytes
SHA-256: e0c348d58cfc25b82abafbff91f5a69c15cce98d90ce226fbffa2018c383c0f3
font_01_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 10776 bytes
SHA-256: 5794d524078084e5a281a61a994c2742e0a2001d47b447aebd684690dea360b5
font_02_sfnt_off00013556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13556 16160 bytes
SHA-256: 9ffc405fbed68b1ed35cf25504b2a045b5802e2074cf99e6920a228075e829fc

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