Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a2b3692f45575f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 03:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a51e78ce0c7d49ddc3d4247a6d34e13 SHA-1: 8221b0f81cf3a72f4539911cee87ef5a9ef6427e SHA-256: a9a2b3692f45575fcf45dc2e4a97f23a8b6d065e36f386ba940520bdbe52df89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a specific heuristic indicates it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URI findings point towards a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=how+to+transfer+android+to+mac PDF link annotation
    • https://bucatariizidite.ro/printuri-fi/files/tapoxisilenevasebufupuvi.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/zisemor.pdfPDF link annotation
    • https://mhreng.com/userfiles/file/gemuzewunezivazinuwatine.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210902_A2D91E020D833E54.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/gigezemoxuwufedujaxenev.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba4d9c7d9---xoresebonasoleluz.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/subalizuvi.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/wogolulozogagofa.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/95426580009.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/13362007466.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/ligazoxonanavizuzonewe.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/xevagifedemenubata.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/88765397305.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/30195899501.pdfIn PDF document text
    • https://scalping.ir/data/files/file/77319712055.pdfIn PDF document text
    • http://elpijisystem.com/file/45531368293.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/rukapodasadexufo.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/28738786516.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ke384e8nglo8bcgvuga2ebs449/peluweserajugaw.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/dilulasisomememu.pdfIn PDF document text
    • https://ms1oke.com/contents/files/miviwopeta.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/79405423822.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_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 17664 bytes
SHA-256: a42aa4651940e2d8b11011a724b775aeba75ec7de4c1da38d2ffa6d53d5a6eeb
font_01_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 10668 bytes
SHA-256: c3a4e671fa96392ba5e82a7db83576bc0b6ba6e70a1fbee2f27f2fbc68df7c52
font_02_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1