Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88bbeb51e30a98c…

MALICIOUS

PDF

73.9 KB Created: 2021-03-16 08:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b0737c133b6d97d74594546d2a6f5125 SHA-1: 4fbf7932f88fd93f3dacf11441fa57cf9577dc6b SHA-256: f88bbeb51e30a98c2dff634a0b45efdb84722eeb05cb31def4ea38526f1aff5d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that appears to be a lure for academic content, likely to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=irrigation+engineering+pdf+nptel PDF link annotation
    • http://xenalebosob.scienceontheweb.net/foxoxigobozoxozodu.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/jfiaPhi/escape_plan_2_full_movie_watch_online_dailymotion.pdfIn PDF document text
    • https://cdn.sqhk.co/tikikizeveni/Kl6iaju/jaggery_chikki_calories.pdfIn PDF document text
    • http://20970907.net/sobowigonesukevolokufhavrg.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/pghij5j/tiles_for_kitchen_floor_ideas.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/76028831635.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/good_transition_into_first_body_paragraph.pdfIn PDF document text
    • http://flipping-car.online/attack_on_titan_wiki_12230vkj.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/bGqjghb/battle_for_the_galaxy_download.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/53399725439.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/babinotubuledu.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
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_912685a2f7fd4c63bcfbf555edddcff3.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_daf39caa37664281b7e37b4b82cc4d03.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_15d91d25b8a24fc583a7cfa23b8118a0.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_5417f30932f7420c9af750d46983424d.pdf?index=trueIn PDF document text
    • http://lijowavatajo.myartsonline.com/aptransco_syllabus_download.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_b22f46326820408895eae2e74054d4e1.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_a25ada7ad26e405db7e1d5bd0231305a.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_5f64ec99f11642beadc52ff5c77d0b44.pdf?index=trueIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_a17e24e62ef1490d8e36b7867a747d1a.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_0a5011ae07d14242a023cba332f686c6.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_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 4756 bytes
SHA-256: 0026ba51ab658ec744e5112a975c205e7cbc7b22a353217a395f439f715230ef
font_01_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 10696 bytes
SHA-256: 4a10f3fbb4034abac586cc3ecf1e57d4659b7337bb084f54d30f108c51803101
font_02_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3