Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a83b6e9ad2194f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 04:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d2f6ae61fd97eebeb6812d526b13cbf SHA-1: 9dee015a2abd8d0fb96d93a0e20050cf3df9179c SHA-256: b9a83b6e9ad2194fcbe8cf7a900eeedce502f50a3e2bf67b8f1bb6e9c3a4434e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or exploitation process, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://crysiq.ru/uplcv?utm_term=texting+app+for+android+and+iphone PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161426f33ded9e---desaxufe.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/fusagekolalodumifi.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/3500251328.pdfIn PDF document text
    • https://noddy.nu/images/file/16818150772.pdfIn PDF document text
    • http://mayjack.com/upload/files/32270807855.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/dalipulujenepafo.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/kibosu.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/lidenefuwijusunowobuvamo.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/85611596968.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/4615733439.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631755104.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0e05bb63c---16508918134.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/45511791402.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/81678320164.pdfIn PDF document text
    • http://ave-france.com/pics/files/55253483493.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/werigekukoxejilaterepe.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631444351.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/venuzozoguwuz.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/temikamo.pdfIn PDF document text
    • http://saimiri.name/upload/file/2317981503.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/lavok.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/toxapegoruteriko.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_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 10628 bytes
SHA-256: b8befcaeb75760c0fe89d7a214a72852137d4d172556c6836dcb56117df948d5
font_02_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 18084 bytes
SHA-256: 0401ead872a945b14941c74b01fafd2d2aab1812c507076e136ef31297b3369c

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