Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dbd0d347d61e76…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 13:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a0d11e039b0504733a68702a3040d089 SHA-1: 6ad27310ff6212195eef1ad10bbae689bb27c522 SHA-256: b5dbd0d347d61e76e0f64984d0fc76b64d2d85fffc96f54fab08270a1b08fbed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external sites, one of which is `https://cructi.ru/uplcv?utm_term=hd+camera+for+android+apk`. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=hd+camera+for+android+apk PDF link annotation
    • http://www.prakashirrigation.com/uploads/fck/files/92629203721.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/bagoruvikizu.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/woxifi.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/25203104363.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/gagewokuwinudiwusizo.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/24357769230.pdfIn PDF document text
    • http://limoride.net/gallery/file/29116023575.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/70654696215.pdfIn PDF document text
    • http://knipia.com/userfiles/file/zoreporizusipakeg.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f95f80a83---xewatuso.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/27708121273.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/52997548098.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/turarujoloraxavowiketo.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/46957253561.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426b7f6513d---lanewafimito.pdfIn PDF document text
    • http://yuli-china.ru/d/files/kevaxaku.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/rokexosulenubawagisizu.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/40081504237.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/78779760316.pdfIn PDF document text
    • http://intersonik.eu/upload/files/perel.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/ninomugutuzoriji.pdfIn PDF document text
    • http://355353.ru/userfiles/file/24927757929.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/newovikule.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_off0000bda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA7 16640 bytes
SHA-256: 6715135c5a2283f7e00451a22409af76953fa5b8f5efea1b4d56197c05edda85
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 10552 bytes
SHA-256: da316a9e51e6cfce9894dae3efb5dcb9096c497d280c6061a41d70ff31c5edeb
font_02_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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