Malicious PDF — malware analysis report

Static analysis result for SHA-256 895a7d2ab5b4c738…

MALICIOUS

PDF

86.2 KB Created: 2021-03-24 06:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 85df411ea8173096c6bcd1ec6dd3da4b SHA-1: ce1fd6de4ca534b73086b956c9e1ff3f392bfea5 SHA-256: 895a7d2ab5b4c738b2e1ff9c825f5a95fc7c7ae1ebb6e67bef0e3517ec4a92c4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are part of a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to PDF downloads, reinforcing the lure.

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://midufefew.ru/wix?keyword=europe+on+a+shoestring+pdf+free+download PDF link annotation
    • http://matanusebatug.22web.org/when_covid_19_end_in_philippines.pdfIn PDF document text
    • http://myfavoritesun.xyz/standard_reduction_potential_table_webassignmhj40.pdfIn PDF document text
    • http://jobauthor.online/6043368549em8kq.pdfIn PDF document text
    • http://bio-ita.fun/python_data_science_essentials_3rd_editionhthlg.pdfIn PDF document text
    • http://jushq.club/google_chrome_extension_ers5xdo.pdfIn PDF document text
    • http://evromotors.net/jikolivug3a2zw.pdfIn PDF document text
    • http://br1.red/air_force_1_blackgk2er.pdfIn PDF document text
    • http://divasamuzive.iblogger.org/42480884632.pdfIn PDF document text
    • http://forexgeeks.net/50_easy_classical_guitar_pieceslqfky.pdfIn PDF document text
    • http://perevod24-card2card.site/intouchables_fly_piano_sheet_musicywh5u.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
    • http://bewukikakew.epizy.com/facebook_video_to_gif.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/cengage_physics_for_neet.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_2133e049de424fbc8b37cf2ec9504989.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_e2f9e52b209e4a69a30158d6bf459c5a.pdf?index=trueIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_ad6b5651e343477e98dbdb493b275b0d.pdf?index=trueIn PDF document text
    • http://jofawapedoguw.rf.gd/socket_programming_using_c.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_cbe99991310d4622b9863105ba08ef92.pdf?index=trueIn 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_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 5232 bytes
SHA-256: 426cd8840ffff904b476cbf109093543e89eb3ca9712d9f7f69eea2afb9e8f02
font_01_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 11792 bytes
SHA-256: d1bf93a441eaa048f60565327533a6eeca49752a9eb292e1a52d692613a793d6
font_02_sfnt_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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