Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6a3fe32ab0689a…

MALICIOUS

PDF

90.1 KB Created: 2021-03-05 22:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a765bec7e82f21bc871aaea430a7c29 SHA-1: 428d2e06891f70645d451593360742412a6fc478 SHA-256: 9b6a3fe32ab0689a808e9f748ffbad3e59fff643ebf7e8c64153c1c239bd01bc
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to external URLs, suggesting an intent to redirect users to potentially malicious sites for phishing or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/award?keyword=how+to+clean+a+m50+gas+mask PDF link annotation
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/900500.pdfIn PDF document text
    • http://shortsomfj.space/autocad_electrical_tutorialo58hb.pdfIn PDF document text
    • https://bosizeke.weebly.com/uploads/1/3/4/5/134596703/topugomijuro-vodobofeje.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/kamiduna.pdfIn PDF document text
    • https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/xajuwa-sukesilinu-begaderaku.pdfIn PDF document text
    • https://bemaxeviliw.weebly.com/uploads/1/3/4/4/134482954/rigekoniremaza.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/xujixobinog.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/vodaporizetufi.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/ninudo.pdfIn PDF document text
    • https://moraraxewurazi.weebly.com/uploads/1/3/4/0/134042425/gujitekoviwozo-moseju.pdfIn PDF document text
    • http://raxanoxev.22web.org/bamoguvumi.pdfIn PDF document text
    • http://digovin.getenjoyment.net/gatavadizuzukumotufikisa.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/57336340473.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/ziposulu.pdfIn PDF document text
    • http://salearea.pro/does_usps_send_internationallyc5m18.pdfIn PDF document text
    • http://antonioit.fun/retro_city_rampage_dx_plus8joo9.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/o_que__titulo_de_capitalizao6blrp.pdfIn PDF document text
    • https://nupetumagapet.weebly.com/uploads/1/3/1/8/131859993/jigavuxitafa.pdfIn PDF document text
    • https://noxajigaja.weebly.com/uploads/1/3/4/6/134698193/2856611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lamuvovaw.epizy.com/36325913166.pdfIn PDF document text
    • http://ropajevunowijit.epizy.com/jobstreet_singapore_salary_report_2019.pdfIn PDF document text
    • http://gugawojakopa.rf.gd/assistive_touch_apk_for_ios.pdfIn PDF document text
    • http://rozivirewim.rf.gd/fact_or_opinion_worksheets_for_grade_4.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_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 5408 bytes
SHA-256: 0efd10bbde3ec2ed7301c57dd6171a376e1f2126d22326f5585c326688dee03c
font_01_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 10684 bytes
SHA-256: c519bd194a87870cc9eb0f6a0507db1e67b64f4ae20f645affbaa021c33a1dea

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