Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df468ae5cd70279…

MALICIOUS

PDF

86.5 KB Created: 2021-03-21 09:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2986a6d45def7832d042aeee09b1b5b SHA-1: e278406987446160c504582fcedee2cd48d25819 SHA-256: 4df468ae5cd702792837d9796c1b8756c67ea64f8671c76f96a64ffbaf505e9c
66 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers as malicious. It contains an embedded URI pointing to a suspicious domain, 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The PDF's content appears to be obfuscated or corrupted, but the presence of external links and the ML detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://resalured.ru/123?utm_term=isolation+of+aspergillus+niger+from+soil+pdf
    • http://tifizifojaf.iblogger.org/android_room_sqlite_version.pdf
    • https://cdn-cms.f-static.net/uploads/4472221/normal_60430d82468c2.pdf
    • https://cdn-cms.f-static.net/uploads/4392207/normal_60409edf40313.pdf
    • https://static.s123-cdn-static.com/uploads/4378383/normal_5ff8bbb936108.pdf
    • https://static.s123-cdn-static.com/uploads/4453885/normal_5fcf77505c197.pdf
    • http://denazofumoxebo.iblogger.org/hungarian_dance_no_2_violin_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e847b2f6-6b5c-421c-81da-3e32e5b24746/how_to_connect_soundpeats.pdf
    • https://s3.amazonaws.com/lodazojamuva/rijigi.pdf
    • https://s3.amazonaws.com/kisagoz/67547495381.pdf
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_e2ad7c86ad9b48e5960d2376c82c9f2e.pdf?index=true
    • http://kinapemib.rf.gd/mind_mapping_ppt_template.pdf
    • https://s3.amazonaws.com/tokatefozude/96373358886.pdf
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_efc3a789c9bd49879bd934ffaca5a1e3.pdf?index=true
    • http://fuxewon.epizy.com/federal_holidays_2021_military.pdf
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_07f458c0710a48f584fa6346e86a62f6.pdf?index=true
    • https://s3.amazonaws.com/jozaponi/hp_gas_cylinder_image.pdf
    • https://uploads.strikinglycdn.com/files/132073e4-cb7f-43cd-ac18-be208c0fc543/the_power_of_focus_jack_canfield_audiobook.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_f687ae879d6e4a4aa224d6d3da154881.pdf?index=true
    • https://uploads.strikinglycdn.com/files/719ce5a8-2ab0-42b0-8a03-df0af126e642/best_love_ringtones_free_download_telugu.pdf
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_f306cbf595ef4d01aded1b525d6a681e.pdf?index=true
    • http://xupikilagi.rf.gd/beaconsfield_high_school_sixth_form_requirements.pdf
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_8281891cec3c4843898a08068f9bff07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c83562a-2240-44bd-8fe9-696000e9eba7/94280032138.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010682.bin
627f221ccef5b5cdbc1123c39ecb825ea9c3c7d8b3830a68f6100987a0a33989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 5180 bytes
font_01_sfnt_off00011802.bin
f84425515ba15aa27e65be6f13f27fb6b5c9018ac56ad22830611d3118b782a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 11228 bytes
font_02_sfnt_off00013e79.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E79 4324 bytes

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