Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a5a12ae5aac87c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 01:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48b9993ff78f111ef4e0e1d0042415dc SHA-1: 2e5e7839ba978689fd6cdf404c57eacd3405d223 SHA-256: c7a5a12ae5aac87c132c848cd8b871678f03c02c68afbb4e8d0e28ec88db79f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of external URIs strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' indicate malicious intent.

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://irlanc.ru/uplcv?utm_term=playstore+update+apk PDF link annotation
    • http://snabsz.ru/ckfinder/userfiles/files/nudebowuletukizubevo.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/gepetibaluwejitip.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/rarowero.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/kixenaxixeginirutowe.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/66958665131.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/43322382365.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/xesaxazelodudomuj.pdfIn PDF document text
    • http://www.puhito.hu/uploads/mibivep.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/14692907454.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/72380297396.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/xawedidurokobedi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a20b31a2e---46537978535.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/52376200274.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/62812091216.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210917_005500.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/segoninuvesusozefuselot.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/pukakumovoxuvakonawifelu.pdfIn PDF document text
    • http://355353.ru/userfiles/file/salotenalu.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/mofunilusepuniwir.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/baziwokaruxumevijevidew.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/49198097580.pdfIn PDF document text
    • http://tzsunup.com/upload/33276716309.pdfIn PDF document text
    • http://gotween.com/userfiles/file///79559220306.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/fasagaruz.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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10496 bytes
SHA-256: 031a05820974ea2f9d0cf37bd8ef8625b37905de9c6e4eddd0c50a8e8d666fbc
font_02_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 18232 bytes
SHA-256: 1415da151865fc548f6fc28acb082a14bc7b4be6f884453f3d21a3a32e60ae4f

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