Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e85b6b9eb8ce65f…

MALICIOUS

PDF

79.4 KB Created: 2021-03-13 19:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8833618b95263de153ac7f8738d6c5c9 SHA-1: 10972c0ceec616210d8271a01ad832154f258f14 SHA-256: 4e85b6b9eb8ce65f312b2811f1178d4090b4e5217a27d306f7834a77ef7f1882
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to "retropie instruction manual" and contains numerous embedded URLs, many of which are hosted on disposable domains. This pattern is consistent with phishing or malware distribution campaigns, where users are directed to malicious sites. No scripts were extracted, but the presence of many external URIs suggests the primary attack vector is directing users to external resources.

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://vilenefex.ru/wix?keyword=retropie+instruction+manual
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/5f406a.pdf
    • http://mutujejeturuduf.medianewsonline.com/what_to_mix_with_apple_crown_royal.pdf
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/9460331.pdf
    • http://xusatekekosigi.iblogger.org/gibubobuvi.pdf
    • http://sitebomobegux.sportsontheweb.net/physics_volume_1_5th_edition.pdf
    • http://vumexovuvelafe.medianewsonline.com/new_swiffer_wet_jet_wont_spray.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vexodefi.rf.gd/kutuwuwupesaxopuv.pdf
    • https://uploads.strikinglycdn.com/files/8b8fe288-89a0-4b1f-a61c-48de6cb09b05/97610027.pdf
    • http://turavewolap.rf.gd/prentice_hall_literature_the_american_experience_online_textbook.pdf
    • http://lowazuxakosilal.epizy.com/lijedudipexij.pdf
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_4797b44c2a1d4a70a5de0a8f534aaa5f.pdf?index=true
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_4d49c4e6c09a45bd91cb20eebebb829d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e003e5ab-f486-4f52-86db-9a2dc1334a8f/xiwavev.pdf
    • http://kifavudufolafu.epizy.com/kerbal_space_program_free_alternative.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_df35a858b03d4217a807660fba6591ce.pdf?index=true
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_d8dbdaf19b9748edb6320031ff7467d8.pdf?index=true
    • http://dapomajaberi.epizy.com/angular_material_reactive_form_reset_validation.pdf
    • http://tularapexodubi.rf.gd/eclipse_phase_second_edition_quick-start_rules.pdf
    • https://uploads.strikinglycdn.com/files/bc4e2103-0d0f-4693-8f04-34f1dfff6617/how_to_improve_emotional_regulation_child.pdf
    • http://xogaxuf.epizy.com/vogubap.pdf
    • http://xeligelejo.rf.gd/hannah_arendt_trke.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_off0000f09e.bin
06c9c82b1c7ea956dc0f35f1873a7c7f6a9fefe1bb8de408e30ee1efb8df98d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 5084 bytes
font_01_sfnt_off000101ce.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 1800 bytes
font_02_sfnt_off00010a5b.bin
d26eb90f20f06b5c1596636bef216ec9c523b3e422a6e0a37f0285a7d1eaafdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 11236 bytes

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