Malicious PDF — malware analysis report

Static analysis result for SHA-256 146616f602fac8d1…

MALICIOUS

PDF

70.5 KB Created: 2021-02-24 13:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6ad8ace8eca0ddf9816bda001259cdb6 SHA-1: fc759016affc8fe604be24d10535908ee7a25a4b SHA-256: 146616f602fac8d16d0bfa61485a046f187d32e2c2daaa8e5bce480e3b1508bb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a strong likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to geographical information, likely to trick users into clicking the embedded links.

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://jottigo.ru/strik?utm_term=world+map+with+latitude+and+longitude+and+equator PDF link annotation
    • https://cdn.sqhk.co/mekewufi/mUjeggV/94781832050.pdfIn PDF document text
    • http://qwonder.space/what_is_the_width_of_a_ford_ranger_truck_bedu7fau.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478398/normal_60362ab496d82.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/words_their_way_spelling_levels_by_grade6max5.pdfIn PDF document text
    • https://cdn.sqhk.co/weteroliwo/jjgjcRf/6124277945.pdfIn PDF document text
    • http://tomogorman.com/26842913372y3jcd.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/HjdNVd8/binijojinadaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/IXMjgIR/zetarezire.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/hcRhiib/70241183662.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/pjjqgg7/xupupag.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/TEvGxhe/wozegalitig.pdfIn PDF document text
    • http://teplotronic.ru/kopisefutatodubtjsco.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/eBAGtZ0/13601010983.pdfIn PDF document text
    • http://itabody.space/geometric_sequence_and_series_worksheet_answer_keyj0wxl.pdfIn PDF document text
    • http://amsidgi.xyz/dni_tygodnia_po_angielsku_dla_dzieci_wiczeniazpgi7.pdfIn PDF document text
    • http://e-devletodeme.net/wapifululudijazojaifzab.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/ehhhhZG/file_manager_for_android_2._3_free_download.pdfIn PDF document text
    • http://arevakar-travel.com/panorama_camera_360_androidpnmjp.pdfIn PDF document text
    • http://istlan.fun/78266871425rznk7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ditinalozevid.epizy.com/format_for_applying_bonafide_certificate.pdfIn PDF document text
    • http://punegejofuj.epizy.com/ce1d_franais_2019_guide_de_correction.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_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 5428 bytes
SHA-256: 3eb133c4881fe1b1aaff4045d136a284f690dc74fe8a575d9d002f63319c664a
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 10808 bytes
SHA-256: 1f4bf531d92fa8d75a05358aa50ab58662db48d6a8459d0f2bef119adc88ce7a

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