Malicious PDF — malware analysis report

Static analysis result for SHA-256 f031a4330ff79375…

MALICIOUS

PDF

83.9 KB Created: 2021-03-18 18:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d78104a8672d8673bb3fb8f299ed072 SHA-1: 1423a8376808565d451f88148c7ad0da23d098d5 SHA-256: f031a4330ff79375dc56fe00e41d1ea5dbf6033ce661c06d84bb59fb9e8d1fb1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL pointing to 'resalured.ru'. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=introduction+to+automata+theory+formal+languages+and+computation+pdf
    • https://static.s123-cdn-static.com/uploads/4427085/normal_5fcaa426edc14.pdf
    • https://cdn-cms.f-static.net/uploads/4411228/normal_5fe9e0d63dceb.pdf
    • http://koxelovanalimu.getenjoyment.net/cules_son_los_animales_que_estn_en_peligro_de_extincin.pdf
    • https://cdn-cms.f-static.net/uploads/4460975/normal_6049097859f6f.pdf
    • https://cdn.sqhk.co/logulemuset/jBbhchb/best_graphic_design_software_for_chromebook.pdf
    • https://static.s123-cdn-static.com/uploads/4455380/normal_60078c6f19d92.pdf
    • http://kiramosowufotir.22web.org/39867696070.pdf
    • http://nadipewin.mywebcommunity.org/32054827069.pdf
    • http://leporabev.mywebcommunity.org/ddo_summon_monster_ix.pdf
    • https://cdn.sqhk.co/dapubebireba/h6gf7ij/baby_pink_and_blue_ombre_nails.pdf
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5fca6b991ea18.pdf
    • http://xowozumevabig.66ghz.com/1385806205.pdf
    • http://wujanebinemeru.iblogger.org/georges_bataille_accursed_share.pdf
    • http://rabemedexisubis.mygamesonline.org/42715939990.pdf
    • http://papotanepif.22web.org/factoring_polynomials_worksheets_with_answers.pdf
    • http://nigodofifulo.scienceontheweb.net/ropozezozojobus.pdf
    • https://cdn-cms.f-static.net/uploads/4371267/normal_60402f9246b8e.pdf
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5fee4ed853fb4.pdf
    • https://cdn-cms.f-static.net/uploads/4423460/normal_60532b81b3876.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wulibazosuxib.onlinewebshop.net/7753100202.pdf
    • http://likutolejit.onlinewebshop.net/zawunat.pdf
    • http://pimobepetokonud.myartsonline.com/servant_leadership_greenleaf.pdf
    • http://molujafit.atwebpages.com/95308588455.pdf
    • http://gixiluvigatekij.atwebpages.com/arduino_mega_2560_cnc_shield_pinout.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105bd.bin
0c66059d442b72763c0e60af25f8dca2eb1680a970ef00d2798fa78bd1b27b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 5608 bytes
font_01_sfnt_off000118b4.bin
2c1dec7ef645080d37b9342347554f0529ba495600f5d549451242412a70fa26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 13000 bytes

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