Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1ba7c852821d7e…

MALICIOUS

PDF

83.9 KB Created: 2021-03-30 09:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab3f2697413207a64b3fb4ea8af5d56d SHA-1: c288a60c59556f032c4b3c063934e9952e1ccb98 SHA-256: 0d1ba7c852821d7edf3eb8b12975c8b17d0fdf34f9a31a4e58405a7769bc8328
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, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://resalured.ru/123?utm_term=ardex+na+technical+data+sheet
    • http://instapriz.online/35276120505idb49.pdf
    • http://masirudukumope.iblogger.org/zejuj.pdf
    • http://hotita.space/638068511044h1r1.pdf
    • http://bossyonlinex.com/fluke_1507_price_ukdtnpv.pdf
    • http://steblin.pro/letra_de_la_cancion_stressed_out_en_espaol_e_inglesiidvy.pdf
    • http://itagreen.fun/xopebolopujiduravagoneberfd3n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavale/taco_bell_power_bowl_calories_steak.pdf
    • https://s3.amazonaws.com/tokatefozude/international_finance_corporation_president.pdf
    • http://derizivazodox.rf.gd/41708978649.pdf
    • http://burabovedi.rf.gd/tekatetejikalolusejutun.pdf
    • http://tuzotulerijenej.rf.gd/nerelemuzodofo.pdf
    • http://sovizaz.epizy.com/analytical_methods_for_engineers.pdf
    • https://uploads.strikinglycdn.com/files/01ff6011-38ad-4084-94a8-4e424f2e5225/sotaligezexatalavejo.pdf
    • https://uploads.strikinglycdn.com/files/989c1d95-3e5c-4c5e-b75e-07f73d5c2913/27701024483.pdf
    • https://s3.amazonaws.com/muvevanepen/tree_of_life_nursery.pdf
    • http://wewonak.rf.gd/can_t_hurt_me_summary.pdf
    • https://uploads.strikinglycdn.com/files/8c6dda1f-bf37-41f9-9f42-b7cf100d2bfc/the_secret_dare_to_dream_netflix_imdb.pdf
    • https://uploads.strikinglycdn.com/files/849adb3e-540c-4e05-b6d7-9055ca9f33c3/schwinn_26_sidewinder_mens_mountain_bike_black.pdf
    • https://uploads.strikinglycdn.com/files/2f18bec3-b2d2-4cbf-bb5e-7055fac33885/69455897812.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/kojomekiwemi.pdf
    • http://jusibutotesax.epizy.com/literatura_inca_jorge_basadre.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_off00010cce.bin
7400a777ca319c4713c80eb0fb5f713b9691cba9fdd8dd11bacae607bdc17ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 5084 bytes
font_01_sfnt_off00011e13.bin
b059b5e1ffdb4b18823050d76f4da622c1a0a7fb50675a3e050f65187e245b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 10668 bytes

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