Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ddfa4b27dc0695…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 18:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f495bde633897dc7560559a00e253705 SHA-1: 4765ced0769066dd64b09863936097567329f3f2 SHA-256: 52ddfa4b27dc06958e71a364a627772144100cfbc675f1e6ecd65587a94a9cea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and numerous external links suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sh-songshi.com/admin/upimg/file///bumotupovunaku.pdf In PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jilolomala.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/jinivagolowakod.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/bitenubalikuwedodu.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/divupivogaxugiju.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/30763502858.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/beranofoju.pdfIn PDF document text
    • http://52963566.com/upload/file/202109122147269926.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/72590345564.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/wufozibedisakimikusawerel.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/99379333093.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/30992016471.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109020745149174.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/21243491612.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/gigekonimowa.pdfIn PDF document text
    • http://identik.hu/editor_up/50226341203.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/vopimigodewasisu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/32787721861.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109092037044927.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/saduredovetuwure.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/venoxemonajepuf.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/mezutowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=solitaire+tripeaks+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 17216 bytes
SHA-256: a7b13911754488f46d772c72572321d3a4b90eb6532703a15887d1867ea4125f
font_01_sfnt_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 10552 bytes
SHA-256: 8ff92039c8d20a24f496c2ce4bba2c95177145fcc11860a7eb6e674bb9af38b9
font_02_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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