Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a33f3a069fcff1a…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 22:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38c2cb3fff45d2066895d743accae583 SHA-1: 4ab0e6f8b5162a47f4e7e72b26b9806d54ae2854 SHA-256: 7a33f3a069fcff1a4cb3de3300809a96841d15ea132dd216085fe4caa5f6c2fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users through a series of links, likely to a phishing or malware distribution site. The document body content is heavily obfuscated and unreadable, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://pune-india.info/userfiles/file/joniripomisasizupobopeso.pdf In PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/899068926.pdfIn PDF document text
    • http://freeorden.com/media/file/faxilanoxim.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/legigoxisu.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/14616058670.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/64750118049.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/14325441290.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/49460784938.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387656ba2e9---xixajo.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/dopusopeje.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/86815021073.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/poxexogodinagaxevi.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210905025645.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/92700910459.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210903184231.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/35003329841.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/vibakikoradomupeselup.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/jumufaxala.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e74b2e91a---5778898638.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/remorifojo.pdfIn PDF document text
    • http://huiking.cn/uploads/file/111557087355.pdfIn PDF document text
    • https://bloc-immo.com/images/39440458564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bloxburg+house+cheap+2+storyPDF 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_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 11084 bytes
SHA-256: 1aacefb0e1de78a733e44cf1ce3a4347d2dd3969ecec7d8cfbab0403caea82fa
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 17112 bytes
SHA-256: 54c9ea999ff4cb3e80fdb50af1a258c8a2b093d6dc777b6642f7d7d5c597587d
font_02_sfnt_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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