Malicious PDF — malware analysis report

Static analysis result for SHA-256 88edfe74697c5c8f…

MALICIOUS

PDF

84.4 KB Created: 2021-05-19 09:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b8f484cf7b9c615003608edca89d2245 SHA-1: 2194c31841c7ff8d0bb7ebc22871142036fe0022 SHA-256: 88edfe74697c5c8fbd594a92aa3e742d85050d1eadfa1f04ee870f74f84d769e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to distribute malware or conduct phishing. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=helmet+heroes+money+hack+free+download PDF link annotation
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/valiw.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/doviw.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/4133398.pdfIn PDF document text
    • https://rogixatig.weebly.com/uploads/1/3/5/3/135323026/putofigotubed.pdfIn PDF document text
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/lakotevamufivuf.pdfIn PDF document text
    • https://pibulibeles.weebly.com/uploads/1/3/5/3/135324177/woreroporijidixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d37e6cc-d858-417b-a6ff-ab3383091546/vubisusixedelizumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee28b64-2b81-4845-835b-de0343b618f0/sisufowuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b802b6a5-e20e-4770-bb65-df7421ca37b3/machine_learning_python_package.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/49323620754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3883d9ae-6476-4b72-9aa3-17b886ff23d1/483257187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ea9a52-896f-422d-a4c5-449abe0bca02/how_do_you_tell_if_a_rabbit_is_happy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56501c82-2048-4d6a-be4a-3e92ab617b12/the_end_of_the_world_skeeter_davis_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73456849-20e2-4350-8510-3c36aac036ab/fevedijirola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad638141-3576-414b-8206-5b1923be30f8/prius_c_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36ea86b-2fcb-4770-8a3a-85a38f09d7e0/dovoretiluleridigegapefos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c5f35d-2fd3-44d4-abf0-537235f028af/product_marketing_manager_jobs_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/148_modeling_the_carbon_cycle_worksheet_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 5480 bytes
SHA-256: 7d4b310061a39b7899e66f2d7556d1b5316f41a358ade2182e626b2293296cdd
font_01_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 12508 bytes
SHA-256: dc7d83a3c8f8a1ecefda80cbd063ae6a0a1f476b6792f1b2758f8cf97dcbcd5d