Malicious PDF — malware analysis report

Static analysis result for SHA-256 d130700c99954a2b…

MALICIOUS

PDF

80.6 KB Created: 2021-05-14 05:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0c218b9c61dc297d9b4cb9d09d84d6e9 SHA-1: 786d2fe72d26d9f54e75c02e10775d32f4d3ae27 SHA-256: d130700c99954a2bed165a81f1cc362f6db13ce45d5a1737977a225a331303c2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable hosting and known malicious redirectors, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=is+starbucks+coconut+milk+healthy In PDF document text
    • http://mavitorilop.22web.org/21628524274.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/Wjhebjc/pifenavinudixi.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/C0Iid8e/prescription_contacts_online_colored.pdfIn PDF document text
    • http://xobukafa.iblogger.org/18436916645.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/XifGuYU/idle_gun_tycoon_game_download.pdfIn PDF document text
    • http://xtreme-sport.ru/disney_plus_login_issuesjkogh.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/ijih6Lz/photogo_no_crop_square_for_instagram_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/5pjeMgg/dutukapabuwusi.pdfIn PDF document text
    • http://juregofazuga.22web.org/myocardial_infarction_electrocardiographic_differential_diagnosis.pdfIn PDF document text
    • http://dilogipusatix.22web.org/30808661268.pdfIn PDF document text
    • http://pejojatodaja.iblogger.org/solve_and_graph_inequalities_worksheet_7th_grade.pdfIn PDF document text
    • http://yewes.space/59501478114cy1fp.pdfIn PDF document text
    • http://arenda-comp.space/popofonazaratif9w7.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/biRxMhh/mediamonkey_android_review_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/fWrhghe/26148375937.pdfIn PDF document text
    • http://imkl-checker.com/mobowovomavexubafsmocj.pdfIn PDF document text
    • https://cdn.sqhk.co/mobixipotex/idhhJ5h/space_wolves_dreadnought_arms.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/GjgULgc/48154054193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawaval.rf.gd/piriformis_muscle_sciatica.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_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 5284 bytes
SHA-256: b25ca46783eb38c63b9f1d11604b7e4d2ef11dbeef11f167077d6398997366f0
font_01_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 11520 bytes
SHA-256: d5af38e76919d132a14d9aa3afc03f44b48fa0116647a5b9b63beaeb74b9706e

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