Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cc3ed7a86d6b41…

MALICIOUS

PDF

73.9 KB Created: 2021-04-01 02:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e57e2c4fb5e5c2a0e008d69c1f4f4b86 SHA-1: b13a11c37c5cead41aabc8328d4b8c284ce6359f SHA-256: 52cc3ed7a86d6b41f873d4f4560b888395de66ca3f4da5a3f350fd64897654df
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise a malicious link as a free download. The embedded URL, https://leonvi.ru/award?keyword=html+file+to+pdf+converter+online+free+download, is the primary indicator of this phishing attempt. While no scripts were extracted, the overall structure and heuristic firings strongly suggest a phishing attack.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/award?keyword=html+file+to+pdf+converter+online+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486963/normal_5ffa0f5d7f8ce.pdfIn PDF document text
    • http://vivaxuza.iblogger.org/67829187492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5ff532caba9b9.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/Ha82Shi/42773061133.pdfIn PDF document text
    • https://cdn.sqhk.co/buvoxinas/jhljex1/best_professional_business_powerpoint_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6047b5fdbecff.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwasusul/tjaCiaM/dipexifarakoxide.pdfIn PDF document text
    • https://cdn.sqhk.co/dutumutu/SidOiiT/augmented_dickey_fuller_test.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/hahjMhe/25792021596.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/ghgdifM/80s_female_country_songs_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jonilinenuvo/fqNgchf/fuluwotes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setikizo/nipefimesawevavuremutab.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/guide_du_routard_paris_9eme.pdfIn PDF document text
    • http://giramipaso.epizy.com/bamini_font_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/lavozetojawijisalegiwopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76780662-11b3-483a-a3ce-2b2158886783/origami_gift_box_with_one_sheet_of_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1748bd34-ddca-4391-a3db-a36dac5fb634/how_to_make_book_stand_at_home.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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 5236 bytes
SHA-256: 20ad5df806f6d2dc12a85e6ad011a7724a0e8d46ba35117e9ed5b6ba0fe2b7a0
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 10676 bytes
SHA-256: f26e82e031b896bc8b9d8a0ceb2ec03c70f4518ac172182c585fdf8d49b3c3e6