Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a5646a9e99ddec…

MALICIOUS

PDF

69.6 KB Created: 2021-02-12 15:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b83e7e704653d9a6aa1ab70c05d4c48e SHA-1: 5ea68695b68353ef821c6a472850eacbf9639467 SHA-256: 81a5646a9e99ddec7c148ee8eddbdbc72d81de0e7accc4cb889f1020e9dc63be
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

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
  • 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://bologen.ru/wb?keyword=thanksgiving%20coloring%20worksheets%20for%20preschoolers PDF link annotation
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/xipikomuxapabid.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/zerakojo.pdfIn PDF document text
    • https://xubetiduradana.weebly.com/uploads/1/3/0/7/130739761/fakubidumanudobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_5ff207746295f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_6026634363ab5.pdfIn PDF document text
    • https://pujuxapalijened.weebly.com/uploads/1/3/6/0/136009243/1958952.pdfIn PDF document text
    • http://xugafigipi.22web.org/23108946180.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/jijisafox-mizino-nijedonunepo.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/dogulamomirewewasusugaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_600b6d6759920.pdfIn PDF document text
    • http://gasojowil.22web.org/talking_tom_2_apk_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixogonabu.epizy.com/6697042115.pdfIn PDF document text
    • http://jategemi.epizy.com/avira_antivirus_free_latest_version_filehippo.pdfIn PDF document text
    • http://jupuluna.epizy.com/zinuzeger.pdfIn PDF document text
    • http://xivutunitilema.epizy.com/action_bar_android_example_code.pdfIn PDF document text
    • http://falufobi.epizy.com/48215670413.pdfIn PDF document text
    • http://verejepaw.epizy.com/28343156062.pdfIn PDF document text
    • http://fasudum.rf.gd/difference_between_attitude_and_behaviour.pdfIn PDF document text
    • http://dalitixusukewo.epizy.com/chromecast_voor_windows_10_en.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_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 5444 bytes
SHA-256: cf30221b7d077fd8642a2478ca56519ae8f9b1e97dc1b31aebc909eca918bd38
font_01_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 10760 bytes
SHA-256: 6718f95cc6d95565a93d76faa74fc8e94d8b1147b63330e34581bbcad931b4f2

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