Malicious PDF — malware analysis report

Static analysis result for SHA-256 d713d8731ebd0d0b…

MALICIOUS

PDF

75.1 KB Created: 2021-03-28 07:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 712045be49b58e532b518ae46bdee019 SHA-1: d79d7ac1364db62275d8066fbd0c1b0554542254 SHA-256: d713d8731ebd0d0b6e1085da6ab7e87666bc4f2bba8ab14282f76aac7a932db7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute content across many low-reputation sites. The presence of embedded URLs suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=completing+the+square+calculator+mathpapa
    • https://cdn.sqhk.co/vujaderaz/JGjfheP/dr_driving_game_hack_download.pdf
    • https://cdn-cms.f-static.net/uploads/4446765/normal_602f38d50a534.pdf
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5fcef15abc3ae.pdf
    • http://miniluk.22web.org/belt_conveyor_capacity_calculation_formula.pdf
    • https://cdn-cms.f-static.net/uploads/4415974/normal_605a580221cfc.pdf
    • https://cdn-cms.f-static.net/uploads/4413373/normal_604319cdc9168.pdf
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fc6cbccd3d26.pdf
    • https://cdn-cms.f-static.net/uploads/4445532/normal_600dc4369ce2a.pdf
    • https://cdn.sqhk.co/tetaxekumipi/e1njche/mountain_bikes_for_sale_amazon.pdf
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5fd7806792a1c.pdf
    • https://cdn.sqhk.co/kawonidoza/8iiijVM/ion_party_rocker_bluetooth_speaker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_1c8e4879a2c446b6b76c5239857c49d5.pdf?index=true
    • http://xuresiru.epizy.com/formule_annuteitenhypotheek_excel.pdf
    • http://zovameden.rf.gd/best_movie_maker_app_for_android_phone.pdf
    • http://rigozapovi.epizy.com/82750951762.pdf
    • https://s3.amazonaws.com/ruzaganog/guide_for_temple_run_2_oyna.pdf
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_d5a0772a50954a3682b0a8c7ed7709d5.pdf?index=true
    • https://s3.amazonaws.com/xonaxevetaf/23894216802.pdf
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_d444d78e8fa841048ce81b25958ddb34.pdf?index=true
    • https://s3.amazonaws.com/lotibabakuj/pupek.pdf
    • https://s3.amazonaws.com/borokegujuzero/92807384253.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_f3e978ee8d084adf9ccd1398cd5e1432.pdf?index=true
    • https://s3.amazonaws.com/fifomi/free_online_acoustic_guitar_lessons_for_beginners.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_off0000e6dd.bin
394da612bc04bdcfd0f39d284164e68e61e119b420429185bee0569a622246f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 5376 bytes
font_01_sfnt_off0000f8f8.bin
d2bf527881370011162764cc3687fcb289d8260f6e0f2abbf2144b2456f3fc70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 11088 bytes

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