Malicious PDF — malware analysis report

Static analysis result for SHA-256 5152f3329a22474f…

MALICIOUS

PDF

89.5 KB Created: 2021-04-06 01:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7334ef1f0b6ac183a1604b2fbb592a0f SHA-1: b84ef272bda2140f0ae2f9045e2c4bc0c70be054 SHA-256: 5152f3329a22474f859f24254a705332923554316c6d429c6dd082f747cdd8e5
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 link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=brush+grass+photoshop+free
    • http://nevinidonet.mywebcommunity.org/relusudifip.pdf
    • https://cdn.sqhk.co/zirigajer/gibPifU/assistir_furia_de_titas_online_dublado_hd.pdf
    • https://cdn.sqhk.co/tibidimewako/cheggeK/lego_hidden_sidetm.pdf
    • http://evakuator-uga.ru/68810355986z14co.pdf
    • http://select-get.top/be_thou_my_vision_chords_cbn3fn.pdf
    • http://novijixonusasu.mywebcommunity.org/sifun.pdf
    • http://begdas.fun/68570725897phe77.pdf
    • https://cdn.sqhk.co/ragonujip/eThbBhi/blocky_farm_tractor_cargo.pdf
    • http://tehnotop.store/manual_sharp_model_xe_a207b1m08r.pdf
    • http://gebojiwikidavu.iblogger.org/carl_sagan_death.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pokinotabopalo.epizy.com/nituna.pdf
    • https://s3.amazonaws.com/fenatagazise/whatsapp_plus_apk_new_version.pdf
    • http://vadarawofi.epizy.com/espaol_lecturas_primer_grado_1993_venta.pdf
    • http://gejizejaniwijef.atwebpages.com/exercises_for_lateral_epicondylitis.pdf
    • http://taludoxatimepup.rf.gd/right_triangle_trigonometry_worksheet_physics.pdf
    • https://s3.amazonaws.com/dazemi/55151940330.pdf
    • http://ziwivazud.onlinewebshop.net/maya_angelou_biography_for_kids.pdf
    • http://rimuwuwugedug.rf.gd/97061818864.pdf
    • http://suguxamux.epizy.com/xedesosawumamon.pdf
    • https://s3.amazonaws.com/zubuwujoxom/kuzuf.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_off0001152a.bin
21601935da74b1bb56e5af157cb7051e6345a5045d98f0980db699e43c1a40dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 4908 bytes
font_01_sfnt_off000125f9.bin
888089b9a98e0af37c9a768e22a1cc2b82ce6d4e099b8646e7a3cd6e169787d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 10676 bytes
font_02_sfnt_off00014a87.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A87 4324 bytes

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