Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d864aee83d203bd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 09:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3304675d44c5728c313211f4ca65f07c SHA-1: 4f7ea7c50fd84627d1bc2c240a937854008fbb79 SHA-256: 2d864aee83d203bdda4f9ac9175ab96754f34becbc9129399128b2e1ab2297b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and external URIs. The PDF structure suggests it's a link farm, likely intended to redirect users to malicious sites. The presence of embedded JavaScript points to potential exploitation or further payload delivery, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bostaninsaat.com/image/files/lerimejubiba.pdf In PDF document text
    • http://fukaofoods.tw/uploads/files/202109171150244730.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/51873894311.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/48802618388.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/dibalunedefabiti.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/86994598650.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/35585319259.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/fegodubodedu.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/rujawotuwutomafaxewulidi.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/winaraninatupisubeni.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/doleguw.pdfIn PDF document text
    • http://idcla.net/upload/files/newaforazevemigodemip.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///kikojuzojomugudag.pdfIn PDF document text
    • http://zaiger.ru/img/file/16122833725.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/90929980212.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630493241/files/gupidofenagajufiwazejeziv.pdfIn PDF document text
    • http://www.depomatrial.com/file/nubujomisilasokuv.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/71654550614.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/54848699294.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091012314873499.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/pamatos.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/6365513592.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/51094406191.pdfIn PDF document text
    • https://mikludava.lt/images/files/40909217236.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/56856847242.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kazusosolasoke.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/14337595224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=stickman+draw+animation+premium+apkPDF 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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 17788 bytes
SHA-256: 4c7164c2e96a7b8ff9c583f9d1b947a9f6c32b0dded65778f68413ab85f38ff2
font_02_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 10812 bytes
SHA-256: 139c9eeab13d187f7b8c2c55ddd084ad1964e9a93a984d9f345a088237ed80d1