Malicious PDF — malware analysis report

Static analysis result for SHA-256 537027839749072e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 04:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af74412108cd1af1c166d016fb3b3173 SHA-1: c5b839abd1aefadfd734405148c68752d89fa544 SHA-256: 537027839749072e748f0644ed54ebb53283e38627184642af3ce348a5834597
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous embedded URLs suggest a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is not uncommon for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=android+vm+for+virtualbox PDF link annotation
    • http://myphammonly.com/luutru/files/devatomeruwokozuso.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210907_CC2A211BD76D2EE5.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/53920352005.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/40779957747.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/29222821138.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/zowulofazajerosemono.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/pefudusuvodaxitesipin.pdfIn PDF document text
    • http://livestocktool.com/d/files/38695683679.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/71365364011.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/85293323415.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630650836.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/xiwowak.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2711eef9bfc61fd190cd722634d3a5be/kexuxifel.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/59908699764.pdfIn PDF document text
    • http://haai.org/upload/file/27430416367.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/jozolobirarodemu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145def616661---nafali.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lobepeloxowawutomalebire.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/tavafosufedumujopaf.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/73361853258.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/59041852154.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/99777512978.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/60295882626.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/wonexu.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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 10604 bytes
SHA-256: 726d42769b91f84b790c5dd3b94a23fa03350bc2becb42582bf4dbf5cddac043
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 18380 bytes
SHA-256: f061609bde6ccf01798bda0cb2e523443e9b4840564ba8f4711bb6b8e618c1ab
font_02_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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