Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdecc1b74aa2799e…

MALICIOUS

PDF

101.9 KB Created: 2021-03-16 14:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 08647dc95c7ec66161ce8f691430734e SHA-1: 1f0968009d3a8a9284eae770064f7eedf1856c09 SHA-256: bdecc1b74aa2799e6dea90000ce72f8abf814ad2001e0e5064971f1da024e248
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'https://crophysi.ru/strik'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of a malicious redirector is a high-confidence indicator of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=hp+elitedesk+800+g1+sff+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_604a15fddfed5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5fc647d3f0bc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_6021f8607439e.pdfIn PDF document text
    • http://expressvpn.store/music_rocks_fairview_parkmulbw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_603e93c478426.pdfIn PDF document text
    • http://dilurijarejo.22web.org/66301715270.pdfIn PDF document text
    • http://bofejaxo.iblogger.org/android_google_play_services_keeps_crashing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_600bffa88ec25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483854/normal_6000e5b0c2ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_601a3ae287be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_601d1307dc56d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_603829bfadd41.pdfIn PDF document text
    • http://storeplus.pro/vurikoniporuyawfy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_600b6d20afcbf.pdfIn PDF document text
    • http://zimarul.iblogger.org/gepuzibuled.pdfIn PDF document text
    • http://foxiwirilavisan.22web.org/pesukewenulipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopixerijoraraw.epizy.com/software_testing_automation_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705bbd44-2114-49d9-8bed-4cb22c3422fe/que_es_ser_un_lider_de_jovenes_cristianos.pdfIn PDF document text
    • http://libejejizu.epizy.com/41135630661.pdfIn PDF document text
    • http://puxetedategekex.epizy.com/demian_hermann_hesse_analisis_filosofico.pdfIn PDF document text
    • http://simolerifape.epizy.com/aggiornamento_android_9_mate_10_lite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c4fd5a-c657-4ccf-bae4-e4ba1be2345e/hp_laserjet_p2055dn_toner_cartridge.pdfIn PDF document text
    • http://gixoluzex.epizy.com/58823981156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4b730a-89d4-4b51-98d6-c1154f2f2806/roland_tr8s_vs_mc_707.pdfIn PDF document text
    • http://kajurilin.rf.gd/35283001782.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 5680 bytes
SHA-256: 68479724061edf8739561f553ec800a3917e499b0066f5a5a9f30af34b04fb06
font_01_sfnt_off00014bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF6 11096 bytes
SHA-256: 81cbefe3335161e6acdf6ce4ebb7ef35b82529deeb8d65002435ad4244da7906
font_02_sfnt_off000171fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171FB 16348 bytes
SHA-256: 2334ade245ec46eaa3943be3e15553e8ac07f98e23f092e9c17c46eab61462e4

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