Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88125c5e4fcc769…

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 15:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f91530573afb08bd753a65d7dab8682b SHA-1: 9cbb24b48fd19237cbdbe9505c9ba0ed57416f3f SHA-256: c88125c5e4fcc7692a1dd8da5d8d4d40908cefea73e4ae76960e7e7e8dcd7ad2
174 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://irlanc.ru/uplcv?utm_term=best+offline+zombie+shooting+games+for+android PDF link annotation
    • http://hbaoge.com/upload/files/mereliza.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/gesuk.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/sorolekabojiwizijikenijav.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/19304130666.pdfIn PDF document text
    • https://morabia.fi/images/file/57662046365.pdfIn PDF document text
    • https://haidangpc.com/contents/files/zuxodez.pdfIn PDF document text
    • https://nevisnews.com/userfiles/82943053494.pdfIn PDF document text
    • https://alev.az/userfiles/file/nigoxobiwovav.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/68294996822.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/79932235066.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/77661072809.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/nemenosibugukagezuzab.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/gikodekepojivepoju.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/5846403106.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/famuxele.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/41627756682.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/77432249640.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dc32606c575f1c9b9f5cd31462b6e9c1/jugiwagofatir.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/gupemumizujovuzebigot.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/filusojaje.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/98384929202.pdfPDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fe5j030c6tegsutpla036du4ma/tozugeki.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zujufalo.pdfIn PDF document text
    • http://wdnederland.nl/file/varekafubu.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_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 11052 bytes
SHA-256: 0c93c20d7b88bd0ea811ff3f13b8fe5ce4a4938231a8b0ea9f5f494574e95d66
font_02_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 17160 bytes
SHA-256: 92fe09c97a88f6dfafc79d14aafe4d73877db0dd9ed017943dbea2653709738e

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