Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd8362b1e8d8b9d…

MALICIOUS

PDF

106.5 KB Created: 2021-03-30 22:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dd435d87a2bc66e4a5d672131854ae6 SHA-1: 1a4024fbb21f66a2febb35b90f446d0cdc50458d SHA-256: 2fd8362b1e8d8b9dc8cf4561646fdb5f9182c501c9f1d8e178e020c4d0a8aecc
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=html+and+css+tutorial+for+beginners+in+urdu
    • http://canlisohbetim.net/sojekefepadna76o.pdf
    • http://tehnopolis.org/manualidades_de_halloween_con_material_recicladofznox.pdf
    • http://vatasefapulik.iblogger.org/vmware_esxi_5._5_free.pdf
    • https://cdn.sqhk.co/zumovinej/hakjgig/baixar_aplicativo_santander_way_apk.pdf
    • http://domainlimax.xyz/2229538601720yp9.pdf
    • https://static.s123-cdn-static.com/uploads/4444644/normal_5fca6cf627616.pdf
    • http://graatorama.space/cryptography_and_network_security_bydn3pd.pdf
    • http://basukoroj.22web.org/82548881972.pdf
    • https://cdn.sqhk.co/mejeteboxav/hcHQsfx/91455015348.pdf
    • https://cdn.sqhk.co/mewivupa/dKjhrjh/iron_force_28_gallon_air_compressor.pdf
    • http://ctuxuu.com/43881148120vae8l.pdf
    • https://static.s123-cdn-static.com/uploads/4408475/normal_600898f640049.pdf
    • http://yewes.fun/first_aid_usmle_2021_downloadcne0v.pdf
    • http://rating-bookmaker.ru/how_to_clean_the_keurig_2.0_needlenpp74.pdf
    • http://helplnstagram-confirm.com/what_are_the_seven_types_of_mental_disorder0vujj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zizolim.rf.gd/dujolapabumigasejisi.pdf
    • http://gawuvuv.epizy.com/baaghi_song_mavi_singh_djpunjab.pdf
    • https://uploads.strikinglycdn.com/files/61cd6233-6ad9-4f8f-99e5-650100850289/latumidozawuviwaros.pdf
    • https://uploads.strikinglycdn.com/files/df0b9d34-00cc-47ca-bc6c-080025cc45e0/the_living_bible_life_application.pdf
    • https://uploads.strikinglycdn.com/files/356610be-faf4-41be-8476-e555182f218f/5555927235.pdf
    • https://uploads.strikinglycdn.com/files/d836fe2d-7d56-435b-ab55-8edaf6c49dad/bosch_500_dryer_maintenance.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000172a8.bin
0338b5a4d0dc198495aaa6a609d612f05d4a38ea7c9c4fc7779ca26f127fb2d8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x172A8 23184 bytes
font_00_sfnt_off00013783.bin
57e9a58748f20b15ebb1b898f1fd78454a87a6c9fdb9841c449761462b89bf20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13783 5444 bytes
font_01_sfnt_off000149e9.bin
549f12cfa369c5db41a5b1e3ab45f3d2490b17724228bdf6cdc606a35ca7ff3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 12068 bytes

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