Malicious PDF — malware analysis report

Static analysis result for SHA-256 07153b9093785338…

MALICIOUS

PDF

72.1 KB Created: 2021-05-12 10:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 67934357b9f4a729d33ed8d445aa077f SHA-1: 41711e684a556e693b01d66b72ab790fbe28a887 SHA-256: 07153b9093785338af2454c788e53de5b5c339c8d9a4c998ddb5991aae559962
166 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document's content and heuristics indicate it presents a fake CAPTCHA or human verification prompt, a common social engineering tactic to coerce users into executing further malicious actions. The presence of numerous external URLs, many hosted on disposable domains, suggests an attempt to redirect users to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://resalured.ru/strik?utm_term=delonghi+magnifica+s+ecam+22.360.s+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485016/normal_602f1c9110615.pdfIn PDF document text
    • https://jodejivosarixu.weebly.com/uploads/1/3/4/3/134314211/2747013.pdfIn PDF document text
    • http://cyberlife.store/tdlichste_taliban-Waffen_der_Kriegenp83f.pdfIn PDF document text
    • https://nuvaxavixo.weebly.com/uploads/1/3/0/7/130738964/torutas.pdfIn PDF document text
    • http://vasizazesunof.medianewsonline.com/micro_irrigation_system_design.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/fiwugopuzawin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480595/normal_6012c3adb9da3.pdfIn PDF document text
    • http://bonboxstudio.com/2725148676u6zrh.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/591796932830gsbi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_604e3ca1dacfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_60604f45855cb.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/9853487.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/sirilifixabu.pdfIn PDF document text
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/eb6f57.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/service_certificate_sample.pdfIn PDF document text
    • http://rezonansmusic.com/samsung_voice_assistant_turn_off_a10ees7yf.pdfIn PDF document text
    • http://teren.fun/vumupegumoswtzbn.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/45894237354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_604d83a31ace0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavavezalibizu.rf.gd/woxepivojovuvawodidojele.pdfIn PDF document text
    • http://texaliborobiko.epizy.com/begodokokijuzutavakiwiz.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/91046196370.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/64267973252.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/truck_simulator_usa_apk_mod_revdl.pdfIn PDF document text
    • http://dogefifuga.rf.gd/ramemu.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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 6052 bytes
SHA-256: 25af048f4c61585763eba455f084f91b14cb6fbeae0eeffd82daf28ce61a2403
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 10056 bytes
SHA-256: a45adc9c75ed08d03c0e50c31594dc600a27517bc457dcacb8d92b4535e23fc3

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