Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35fbe70b28db85a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 15:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8a5a0d41a27197ce4ac0694c8f41fad7 SHA-1: 50f085598a022134a9cc1d4ca7bc8bbe8954b0e4 SHA-256: f35fbe70b28db85a980ae029bc98ac61579166f11974932dd45e814967ff7c65
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. The 'QR_LURE' heuristic further supports this, indicating the document likely instructs users to scan a QR code, a common tactic in phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=qr+code+in+iphone+11 PDF link annotation
    • http://wmsone.com/eimages/file/zafix.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/76324252630.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/36499616807.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/xejerarifakeganadi.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/pinebike.pdfIn PDF document text
    • https://la-klamm.org/Files/files/15873603455.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/59667582108.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5aa49c8d---goxukufupo.pdfIn PDF document text
    • http://medrea.ru/upload/files/watepomotipugojepusomu.pdfIn PDF document text
    • http://hotechike.com/files/files/filapazebekeneduruzipofa.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/duboresujabobenaviwagem.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/77448080778.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/7051236060.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/66940876333.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/27983705715.pdfIn PDF document text
    • http://masonhn.com/d/files/bunofobe.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/11542368244.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/80913428943.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/46907758093.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/44922897890.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/16401313746.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/bikopu.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210910_E69216513E57028F.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://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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10248 bytes
SHA-256: e403600778b6814f4937d66894724f10b84432448e5b489577d5273e88fb7bba
font_01_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 17148 bytes
SHA-256: 9924df149f42aaa5253427766447b75b461a84792e6b01103085a88953250c80
font_02_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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