Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22cab3a60860d92…

MALICIOUS

PDF

81.5 KB Created: 2021-04-25 14:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 123e6a49b04e4f60442032b84496fe70 SHA-1: 2e01bc77a6979a513a68d5360d7da7934e075fc1 SHA-256: a22cab3a60860d92659ca8e9a2afff58bdf4ff575365a06ae522d528d886db9a
246 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies an impersonation of Instagram, directing users to a redirector URL. The presence of embedded JavaScript, although not directly visible in the DOC BODY, is a common technique for PDF-based attacks to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/7168331.pdf.
  • 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://pelibifir.ru/strik?utm_term=angelcare+baby+bath+reviews PDF link annotation
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/7168331.pdfIn PDF document text
    • https://buxomajuse.weebly.com/uploads/1/3/4/5/134588570/gawukugovufororilate.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/vonaguretifilozotor.pdfIn PDF document text
    • http://ruzunolesar.iblogger.org/11017093053.pdfIn PDF document text
    • http://weridif.medianewsonline.com/95367529441.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/pearson_mastering_biology_textbook.pdfIn PDF document text
    • https://xatikofaf.weebly.com/uploads/1/3/0/8/130814669/8304774.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/2692121.pdfIn PDF document text
    • http://memisada.mygamesonline.org/zonibofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotasivira.rf.gd/36289343716.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/avast_antivirus_windows_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49183608-1eab-4e86-b80c-20928619bf89/how_to_setup_nec_office_phone.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_9e03a11f16d54e4e879f468a7959fe92.pdf?index=trueIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_27dae91a86bb4074af7a6f8443be47b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/mewuxizi.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/telefono_banorte_reporte_extravio.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/hashar_movie_ringtones_free.pdfIn PDF document text
    • http://ferugasa.epizy.com/epidemiologia_basica_y_vigilancia_de_la_salud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9c1b9d-fa5a-48b4-9302-58df47729a77/does_calorie_deficit_work_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/dinosum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 5444 bytes
SHA-256: 82b50037aca87ca048e3953c54d08869a0757cc42cf6b1624c151aa639714f0e
font_01_sfnt_off00010cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 10256 bytes
SHA-256: 43510c2b04767f1b64db2b747807bdaaba898eae134590b02a04575134939e29

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