Malicious PDF — malware analysis report

Static analysis result for SHA-256 af16d030453b11a0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 18:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be4f4ffc30f804b97e2d030ced888acc SHA-1: d0c9580aec1bcb6d5a1ca1750dfe258bf3b67702 SHA-256: af16d030453b11a0ec9adddc0aee03150b22f3cdae6d0aa8578ab1f951afcdb1
214 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and links to algorithmically generated URLs, indicating a malicious intent to download further content. The presence of a fake CAPTCHA heuristic strongly suggests the document is designed to deceive the user into executing a payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://comp-art.ru/userfiles/file/35790796120.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/41363716087.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/vafigaxazalolakinezojidi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/5513460258.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210901_832E3CF2D6C163C4.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/47258756852.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/giwegomejitolevimulumab.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/kikufanololirixezegaxijup.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/mozudulukixakivumizit.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/gapajosivoruvepasaxabinu.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109110219346155.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61a83fd9d---sukuraji.pdfIn PDF document text
    • https://glozor.com/userfiles/file/lomixanisefoxomamegomub.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/35507695.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d17d74985---23223520665.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/47201505809.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109020102046935.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/bupipudet.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/29256452116.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/japusonazapipisari.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/nufanenijumig.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/voratuzataj.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/zasurivokofufe.pdfIn PDF document text
    • http://insei.eu/userfiles/files/66418887307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fifa+mobile+coins+hackPDF 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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 18776 bytes
SHA-256: 9321ef9d511d3b84f7d2b12b01ff6711f92cacca4e9a347e65aa34579ecf1673
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 10612 bytes
SHA-256: 05dd46eb6b5f00c9ce4518dd8664cc026f55d4a1d0d21971948552aeb791f6c6
font_02_sfnt_off000129f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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