Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44ad3895f5bdd90…

MALICIOUS

PDF

95.2 KB Created: 2021-09-22 12:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d69bb761b8ededa2224c80f7125810a SHA-1: f9f537fcea8e53c2fddef219fed89532e57fdb7e SHA-256: d44ad3895f5bdd901157cd3b4b468e5a9289eb18894e8d7fafabcc991620a4d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous distinct hosts and UTM parameters in URLs, suggesting a phishing or spamming campaign. No scripts were extracted, but the presence of multiple external URIs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://war-old.its.vn/new/userfiles/file/4947129453.pdf In PDF document text
    • http://watthaistuttgart.de/userfiles/file/80353682845.pdfIn PDF document text
    • http://domuran.pl/files/file/xokapejugobulumedijal.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/gubekalowidovafuxesevonak.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/66833757077.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/27852189605.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/dudekilu.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/6805081228.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/72097933320.pdfIn PDF document text
    • http://watch62.ru/files/files/84961775812.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/28523706899.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/robetevotit.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210921182314.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/85187088039.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/gonizepubab.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/vinobefedugobewi.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210920074819.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/94824655465.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/34121882819.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7381c0a3---wapalerotituxi.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/vajirume.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/fojavazogizomixelajuv.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16145147b24af6---29233121761.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021092103265273499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=game+android+yang+menghasilkan+uangPDF link annotation
    • 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_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12578 18528 bytes
SHA-256: 39ba49fc81d325313f89004b3b543a7627f530ceccb02ad55528299807764166
font_02_sfnt_off000155e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E6 10944 bytes
SHA-256: 766050a03c4390faef2a8310cbe0c6e4b04410ce571a2de1de489e7cd3c8bff6

Open this report in the interactive analyzer, or submit your own file for analysis.