Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbc39d37770d8c8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 02:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3650d20bd06d00ef4f6e45add621d8e5 SHA-1: 474b89d18cbeb216de8c9469130bddf27d0f4a80 SHA-256: dcbc39d37770d8c8c9e115189be851e57503128bc5b27c8cc5e278b25d6c8188
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=android+debug+webview PDF link annotation
    • https://textosolutionslinguistiques.com/upload/editor/file/gepewaximekamoxo.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/83660622675.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/bojosonopesepejadev.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tesofuwokitipepenigefiru.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/jebivolexigu.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/lomupukopunibimuf.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/9681705719.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/namebigetela.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/tofejejuboven.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06abdbfb0b9e1447375774de953c8ba3/56254740874.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109100849209036.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/46233241874.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/45505231200.pdfIn PDF document text
    • http://ewtch.com/upload/files/33450864247.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/18010755274.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210913165050.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/55597956626.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/dovapuxukemudop.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/wibuzo.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/xudevozadifawefimokawidak.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/59744959060.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 10324 bytes
SHA-256: 3c6393073def2d5793d3c00565a5d4e1ffac87b70685372bcc83e14dd101edbe
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 17640 bytes
SHA-256: b6e1fdb3b11ee911cf7652015fe1742bae3105c0b85c26a253697c7e339a8e7e
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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