Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a841589f8f8b0df…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 23:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5c39235902efa3d7c0d048e5c578b179 SHA-1: 49e8a87538a927ee18d2d9f6f0cc3d211ae27b89 SHA-256: 2a841589f8f8b0df20043a8beffd3cc382da95c2f2f1aaae942d8ba483d5495f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, indicating it is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on potentially untrustworthy domains. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://allytemp.ru/uplcv?utm_term=history+of+the+american+economy+13th+edition+pdf PDF link annotation
    • http://ahzycw.com/upload_fck/file/2021-9-14/20210914180743695753.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c73e1d6adde770c1f252851161f28653/54108540853.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/39065288010.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/welanulejejimodanowan.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/tiribik.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/milubasikufilasulefuxi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd7c55d5a---kunobotizajalavetawepojol.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/11067754701.pdfIn PDF document text
    • http://gazetavk.ru/img/file/81657521718.pdfIn PDF document text
    • http://cosyromania.com/media/file/diluvixugelafawazivamiwi.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/99587066669.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/89211395121.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/92754264231.pdfIn PDF document text
    • https://kiptep.ru/file/libesu.pdfIn PDF document text
    • https://phnews.ro/files/file/bigelaweron.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/sazifixewegejotomuv.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/xowofunalupe.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/kobewed.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/lonasegixe.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210902191648_gaufv4.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/naxepuforij.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/godalerebikepumiwibereri.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/59841068063.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_off0000cf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 11168 bytes
SHA-256: 063e5251a8d8248d911db4d52e515e6dd2e7fecb69a069904773636fdfbe9f26
font_01_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 18328 bytes
SHA-256: 5203af51873ec3fae5084978fb0f7f715cce068025ce872a09f30eb73dfacfe0