Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b95780d541faab7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-30 14:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 196d87f5f9c0482f6896246bb48339a4 SHA-1: 58f6c5fdad9149d4f8fb88f080d437d81742716c SHA-256: 4b95780d541faab734f9a29c5d71ede4876c66bf700bd377fd23ecc837ba3e5d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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=rewind+film+nikon+fg-20 PDF link annotation
    • https://magivuvesef.weebly.com/uploads/1/3/0/7/130775451/5af9ac3410881.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/uoW0iiA/my_octopus_teacher_review_new_york_times.pdfIn PDF document text
    • http://healthytrands.com/kapitatiuynf9.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/jjhjOhc/assistant_marketing_manager_jobs_nyc.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/48848666933.pdfIn PDF document text
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/4f9576609.pdfIn PDF document text
    • https://cdn.sqhk.co/detatakev/bZZIfZN/2020_presidential_ballot_sample_new_york.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/hiQjegg/register_for_myaviva_ireland.pdfIn PDF document text
    • http://instapriz365.online/american_dad_fussy_dog_episodejgunm.pdfIn PDF document text
    • https://rinavotonig.weebly.com/uploads/1/3/4/4/134477757/1792137.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/9ffd12243f.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/Zy9Ichb/fitbit_smart_watch_sale.pdfIn PDF document text
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/608c4f0fda.pdfIn PDF document text
    • https://waxaveroguwako.weebly.com/uploads/1/3/5/3/135344917/gikamiwipixurana.pdfIn PDF document text
    • https://vefekigut.weebly.com/uploads/1/3/4/3/134391246/lutogo.pdfIn PDF document text
    • https://tazesarazuf.weebly.com/uploads/1/3/4/7/134726557/ridututuso.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/1863209.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/segedotavidibuv.pdfIn PDF document text
    • http://paktum.pro/fear_and_loathing_in_las_vegas_bookcg00o.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/8576aecd-607d-49ef-baa7-00ca3e0e3560/dragonlance_campaign_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06ac142-8d51-4a20-ad8d-26ad917cd65c/fogaruzuzijixunotavofama.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/10th_class_maths_all_formulas_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74cf2355-fbc4-4336-97e1-ea366cdc1120/serta_motion_air_adjustable_foundation_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9772ba-e513-4bb6-be4b-e676e3272d38/inteligencias_multiples_gardner_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8827945-262a-4065-8b04-6217d12ebedb/zekakijarikezusajowulava.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_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 5212 bytes
SHA-256: 3cbcd361d1480075d05ba90579b89e7dce979670dd3639cda180860646563bdc
font_01_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 11188 bytes
SHA-256: 177c30a287a1edd31339b7c1686f0029ee79e9619f69a37c82844a8e8fa5642d