Malicious PDF — malware analysis report

Static analysis result for SHA-256 8186c748070c7efb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 01:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7e96c1e0e30e7fabbffcd2bc54acff3 SHA-1: f82b11ec62612b509851eaa613f6ef851f833819 SHA-256: 8186c748070c7efb9f833b0d53b7acf711e4117900734bad04c92b27b0bc42a7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566 Phishing

The file was detected as malicious by ClamAV and an ML classifier, specifically flagged as a brand-impersonation credential phishing lure for Apple. The embedded URL, while marked as benign, is part of a link farm on disposable hosting, suggesting a deceptive tactic. The PDF's purpose is to trick users into clicking a link that does not match the impersonated brand, likely leading to credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high 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: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+google+play+password+on+android+phone.
  • 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://razredna-nastava.net/files/57820449824.pdf In PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/33370755775.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/78683047507.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/54890242456.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/83696bc359a3a10a1b87dcab39edcbff/53943672742.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/65128748293.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/68017496336.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/nupisilorelununele.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/vogusexefiv.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/32085407255.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/momigapibuzawa.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/pabarajubabuk.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/26117252704.pdfIn PDF document text
    • http://myphamasia.net/upload/files/nakuwinumugomunije.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/gufunonoxinilukejemedufe.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/zezebodaviwisupivotedi.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0e3d389a---29677264002.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/modedodimosito.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/lotitezirikawibakuja.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/dinebudizate.pdfIn PDF document text
    • https://agrando.cz/files/file/51358767244.pdfIn PDF document text
    • https://advik.net/userfiles/file/79139142902.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/jupijujimomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+google+play+password+on+android+phonePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 10984 bytes
SHA-256: dfbe8e61322d5f7b98c3b3250ae8d8c8fc9b11f3249b4e77056245477a565a6b
font_01_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 17644 bytes
SHA-256: 6d21b87da3c0639d1659e069fd92a931eed97ba22004000ef6aa20890b053e8e