Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac8485c68558c49…

MALICIOUS

PDF

76.4 KB Created: 2021-02-21 22:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 39788f728d941d107facc3ed514906d7 SHA-1: ca8bdeed97b7aa42ac81dcc9ccb1fe859d789ae2 SHA-256: 4ac8485c68558c49ea6848337e65650517c062a6ffe5cfef4426922c8fa50886
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a prominent one being 'https://jottigo.ru/strik?utm_term=how+do+you+turn+on+a+skmei+watch', suggesting a phishing or redirection lure. The document body, though heavily obfuscated, contains text related to the search query, reinforcing the lure. The presence of multiple disposable hosting links further supports a malicious campaign.

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://jottigo.ru/strik?utm_term=how+do+you+turn+on+a+skmei+watch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427077/normal_5ff9b5864b627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407991/normal_600fd26ab8a0c.pdfIn PDF document text
    • http://lupaper.22web.org/kiroxadumilafiliwazowizud.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/Zic3aan/vafofusutexogixa.pdfIn PDF document text
    • https://cdn.sqhk.co/rugugojeba/ieQ8Whe/15335570783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5fe01d9e5c9f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_602d9df401646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_60196d2f1e083.pdfIn PDF document text
    • http://seomagnat1.online/sonurumamemakuzisipubm5yw9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5fe628c17e8e6.pdfIn PDF document text
    • http://krepezh.guru/what_size_turkey_can_fit_in_a_deep_fryernt0t9.pdfIn PDF document text
    • http://clubstore.info/picsart_photo_studio_apk_for_androidd2loz.pdfIn PDF document text
    • http://labincom-med.ru/kadhal_kavithai_movie_songstuqme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kajusob.epizy.com/average_salary_of_geotechnical_engineer_in_australia.pdfIn PDF document text
    • http://jopinewo.epizy.com/22730264513.pdfIn PDF document text
    • http://jilabof.epizy.com/airpay_th_apk.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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 5368 bytes
SHA-256: 13ab3c3f10c005baf97ca5f4d15dce685fc0dead2c070d9ff91d0270c3eb98da
font_01_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 2048 bytes
SHA-256: 7d1d8f4167c36277c8fe71225fbdc31aaaca98204796b18c2f8b3e083a802a80
font_02_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 11496 bytes
SHA-256: d029cf2ac59c40e2d64bfa59eef5910ca5876625bef0466dba3b9973bf177ffa

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