Malicious PDF — malware analysis report

Static analysis result for SHA-256 355821ae91e01a02…

MALICIOUS

PDF

92.5 KB Created: 2021-03-22 08:14:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28b189c62e3e1e8b98a3f9927d445233 SHA-1: 504be8b0946a99b31a9df93f4f9db25843efb550 SHA-256: 355821ae91e01a02a456a0ff0109e34e7e2c074c1b8151e951ccce0fccd3215b
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs suggests an attempt to redirect the user to a potentially harmful site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/wix?keyword=curse+of+the+black+stone+quick+guide
    • http://najarixexosavuj.iblogger.org/learning_english_books_for_adults.pdf
    • https://cdn-cms.f-static.net/uploads/4377403/normal_603e93c478426.pdf
    • https://cdn-cms.f-static.net/uploads/4369315/normal_603fc22977145.pdf
    • https://static.s123-cdn-static.com/uploads/4459185/normal_6008ef4abde5c.pdf
    • https://cdn-cms.f-static.net/uploads/4527042/normal_603b36e7cc4bf.pdf
    • https://cdn.sqhk.co/fuludasowipu/UCAhiOW/22767051782.pdf
    • https://cdn.sqhk.co/repudodo/jdXgfL8/dagagitiropilen.pdf
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdf
    • https://cdn.sqhk.co/luwesefizi/6rgivje/healthy_vegetarian_breakfast_for_weight_loss.pdf
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fe853178e40e.pdf
    • http://lebufuvimoxumup.22web.org/amarilli_mia_bella_f_minor.pdf
    • https://cdn.sqhk.co/lowanivari/rgehdlM/35179467954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jibeginogib.rf.gd/lyle_mcdonald_rapid_fat_loss_meal_plan.pdf
    • https://uploads.strikinglycdn.com/files/e1c42a74-0708-4291-9c0a-7423a7156ee9/the_art_of_game_design_3rd_edition_download.pdf
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_e34897326b2f40cd88198fe590923ecd.pdf?index=true
    • http://galinuv.rf.gd/calcium_phosphate_metabolism.pdf
    • http://lavodusepigixu.rf.gd/briggs_and_stratton_675_series_pressure_washer.pdf
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a9b0eaa65b234a8c838db66aa3709576.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d472337-cf18-4810-930e-76cc6156a0a0/olympus_tough_tg-4_charger.pdf
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_e447c553e2a7494e902d88818864acab.pdf?index=true
    • http://fonenutekosut.epizy.com/domanoxonogu.pdf
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_0f9adcc833844b96bb3bbaea39eabdd9.pdf?index=true
    • 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_off00011eca.bin
9d53b4abb4bc64e5cf9409b319529aa83602764bad859a5feb0d3566ba50ea19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 5516 bytes
font_01_sfnt_off0001317d.bin
39888c5a75019b299ea79fbe7eeee6f922caf73422f120bab67128af25ae378e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1317D 10668 bytes
font_02_sfnt_off000155eb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155EB 4324 bytes

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