Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ac5af253eef352…

MALICIOUS

PDF

82.6 KB Created: 2021-02-28 02:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ff0f571f249ae1bceac44eb379063ddb SHA-1: c13e42bcaa976d0d1c8b7c6fabc71137ea27f17f SHA-256: 19ac5af253eef352e536c07a74a1a823bf61f44d2cbaa2438d7781af3d0b6daf
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm heuristic further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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://botokaw.ru/strik?utm_term=what+were+illuminated+manuscripts+primarily+used+for PDF link annotation
    • http://vashe-zdorovie.xyz/valuvirujereserulj6dc0.pdfIn PDF document text
    • http://detonic-ufficiale.website/937229519mq5vt.pdfIn PDF document text
    • http://digtalcaliper09.xyz/geometry_dash_meltdown_full_version_apk_free_download8eun2.pdfIn PDF document text
    • http://naropiwazufilu.22web.org/furaxezivenegowabukiwiwa.pdfIn PDF document text
    • http://jexafagod.22web.org/70473662536.pdfIn PDF document text
    • http://doweryklkq.space/why_is_my_fax_machine_not_sending_faxesn16c6.pdfIn PDF document text
    • http://agnewjacobs.com/outdoor_family_movie_night_ideassb3ub.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/suwogitibi.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/bulodomatori.pdfIn PDF document text
    • https://zolununib.weebly.com/uploads/1/3/0/7/130738801/tedaxazel.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/hNiWpez/red_sun_today_september_2020.pdfIn PDF document text
    • http://nebibila.iblogger.org/100_golden_rules_of_english_grammar_for_competitive_exams.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vavuliremu.rf.gd/english_grammar_in_use_raymond_murphy_cambridge_university.pdfIn PDF document text
    • http://tisikifapov.rf.gd/gobowipukukurosobas.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/harman_xxv_pellet_stove_distribution_blower_not_working.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_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 5604 bytes
SHA-256: bbe1ed1a71c78c6e367e44eec734ece3a484f666f106666ceb4048be888014b2
font_01_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 10492 bytes
SHA-256: 3e82c2594718d532e7f18c15a2b15576a974e698edd2bb0df486f399a343d612

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