Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f63675c6546b5d…

MALICIOUS

PDF

86.3 KB Created: 2021-02-18 21:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9740d3c4f4c03d38b373e8939a81587d SHA-1: 8462bb30e854c68878d120449a4584a036728b72 SHA-256: f5f63675c6546b5d2927d53fb698894069530e7e1a7d65d1a305e053d1eea945
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior. While no scripts were explicitly extracted, the presence of numerous external URIs suggests 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://jottigo.ru/123?utm_term=who+is+thor%2527s+wife+in+norse+mythology PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5fcb3109798a3.pdfIn PDF document text
    • http://ueuniti.website/smash_bros_ultimate_tier_list_august_2020nule1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5fd63c36bb15b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5fff6d9f3a75f.pdfIn PDF document text
    • https://remezovegaz.weebly.com/uploads/1/3/1/4/131406605/2b7f6.pdfIn PDF document text
    • https://zedazepofa.weebly.com/uploads/1/3/0/9/130969939/7692284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5fd11dab4d4ca.pdfIn PDF document text
    • https://lalibirubifo.weebly.com/uploads/1/3/0/8/130873838/ramuwure.pdfIn PDF document text
    • http://zukilobuzoroko.66ghz.com/airtel_3g_internet_settings.pdfIn PDF document text
    • http://onlineeshop24.xyz/gepopadogo7hysl.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/mefujawoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_601fea6559dfb.pdfIn PDF document text
    • http://winoraama.space/2306823154ogvk0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fccc8ba8afc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gexusapinofuvep.epizy.com/sadhu_aur_shaitan_movie_songs.pdfIn PDF document text
    • http://kuzebelinebofe.epizy.com/tourism_holdings_limited_annual_report_2017.pdfIn PDF document text
    • http://xutarefes.epizy.com/assassin_s_creed_identity_game_mob._org.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 7400 bytes
SHA-256: 5a56798a0eebd5810116906c6a362185e077c63d53d414af19c1bc6280798417
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 5212 bytes
SHA-256: 454bbfae918a01a7062186a8816188e4816353e16aab043f72b963e7cbdc09ac
font_02_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 11500 bytes
SHA-256: 6275a0637cbac4f73b64da193290a173c11285ab5f75d6a7391563a0ea333f38

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