Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f33556413fc116…

MALICIOUS

PDF

92.3 KB Created: 2021-09-10 04:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2c7b48be1ec25a95e6a09d274235716 SHA-1: cac0523ce040da2db799652c212a01053b903702 SHA-256: d5f33556413fc116ddbcfd0dc37237668bd1a5057c420feb352ea989b86c6461
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=memoji+in+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7efae31e---65176847565.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/fejesuwutitosaworogujol.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b24b839f0---97419880841.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/66338898339.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fugopelilapozumisiv.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/migok.pdfIn PDF document text
    • http://sjhtractor.com/d/files/korinolesepaliresujil.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/vipekawaxor.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/47336302540.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/9810385765.pdfIn PDF document text
    • http://vaynhe.com/upload/files/63365686298.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/mujedivojijanip.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/wudodetugorazabudijesi.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/37156370623.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/sulezepitati.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139c716895df---femedagojudub.pdfIn PDF document text
    • https://agatanorek.com/files/file/xolopitadixikikeditav.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/68413030103.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/21685060361.pdfIn PDF document text
    • https://coil.hk/upload/files/wokaditutile.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/xarixezetolijosoj.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/pilonudawaxojoj.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/25061779204.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/dimokanefonukem.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 17484 bytes
SHA-256: a129fe52af6296cb4605045908db670e0f97d585673a53a2d5b0d5d6c5981919
font_01_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 10220 bytes
SHA-256: 8f6544ee27f197b7d5f2611816b105383f0813e4fc0fca22331a4bc4e6059fdc
font_03_sfnt_off00014785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14785 18096 bytes
SHA-256: f7926b4252e7015346fe6c73793d8b5f03414ae13ded748336e1006fb7a39200