Malicious PDF — malware analysis report

Static analysis result for SHA-256 083adee2b57a0ea1…

MALICIOUS

PDF

143.6 KB Created: 2021-09-15 17:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 849377e71206a1e7ec4e232bdf83ce02 SHA-1: dfb67243c529569fafa9e223bed5bcf0811ac3be SHA-256: 083adee2b57a0ea12846c1ac807e753f35191af228a103205ecf816173dd77a1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm or distribution mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, indicating a likely attempt to manipulate search engine results or distribute malicious content through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5715

Heuristics 4

  • 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
  • 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://gourmethousemacau.com/UploadFilesfile///jewezimenow.pdf In PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/jowavat.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/bekunawikafovejinuze.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/15826781736133171d79f56.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/28026762776.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/39938796308.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090700481570554.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/tebamadoveroloxusizuz.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/84686372243.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/48534364228.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/13582570363.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/genose.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210914182436_0280dk.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/40375466468.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/kozatimegoti.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9d7ffd5acf195a4ccc4d13f56a255570/96261379611.pdfIn PDF document text
    • http://redactron.com/userfiles/file/10411843798.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/72714477652.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/71661972126.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/zuropakigojipel.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/sifepufobamiwafulef.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/kesenojobanedefilabodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kali+linux+bypass+android+lock+screenPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E10F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F921 21040 bytes
SHA-256: c9aa077e107b45ed8f30ffb1949767e72575f43204a080d6eeec877aa9e75212

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