Malicious PDF — malware analysis report

Static analysis result for SHA-256 533e5842df0b5c57…

MALICIOUS

PDF

82.0 KB Created: 2021-01-05 07:06:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 01fbfab73b4f7d9d89d44a3adb949713 SHA-1: cd7a4ee2495cf0769ddbea402cb644f5a6eaf245 SHA-256: 533e5842df0b5c57f3f69bb04bef021470fd4185bf7f5a5ee0912b89a3c99c7d
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous malicious URLs suggests the document's primary function is to lure users to compromised sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=memory+foam+mattress+full+size+costco In PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/8770814.pdfIn PDF document text
    • https://kexeluki.weebly.com/uploads/1/3/4/6/134627649/bopojowonik.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/kikejives.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/8d39ed48.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/fCtiben/87966688919.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/i9icaii/14574933673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vonutavekip/arbor_acres_broiler_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/sales_objections_and_responses_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/southern_charm_savannah_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/75336039076.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/come_accedere_alla_mail_icloud_da_android.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/xotesaponebejinizovadab.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/music_free_android.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/videoder_app_14._2.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/chapter_7_answers_drivers_ed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 4960 bytes
SHA-256: daab9033c87fda0be37e477a76732b265df092a0d5c3e93c197e0bdee67db3ea
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 10892 bytes
SHA-256: a43c9440d15be532ef8fa39ee58fc004175a75f009021f45649df40a2cbbe28c
font_02_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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