Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc3494be397d8e8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 11:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4115c87a75ab8db011b0756334479116 SHA-1: e6dd9bffab63f4e0e544b6df99be090c6729a977 SHA-256: 8fc3494be397d8e8b046d1262db8f1f07236578bdb13e5ecb712b7ea5d6c637c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious PDF files. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the document, likely to facilitate further exploitation or payload delivery. The document also contains visual download lures, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ncdesign.it/userfiles/files/21357136145.pdf In PDF document text
    • http://simp-q.ru/userfiles/file/jetuk.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/kekegekagolesexen.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/26069365298.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jujubinumawaxawexetanobi.pdfIn PDF document text
    • http://muaklekcoop.com/downloadfile/File/rijokafuluxojemoxosomofif.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/4876292897.pdfIn PDF document text
    • http://kasargod.net/uploads/file/31575196212.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/poxojalekavaralupu.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/29039693685.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/diwulaletozidojazo.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/71396562581.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/40703829004.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/35037255624.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/beravuwipezagejidipa.pdfIn PDF document text
    • https://doitoutdoorz.com/file/wINq5SzAet2lMiGV.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/92999101194.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/fanapitewofik.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109111734357273.pdfIn PDF document text
    • http://orlickachata.cz/files/files/vuzuvewategoruvusobokirab.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/roduwepatiwawagig.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/fijegebatad.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/15230059764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+u+root+your+phonePDF 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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 17280 bytes
SHA-256: 5c7456ecb63cb21498c857c05a35c1e5c97ee8bcf4372f9e262c0bd7f0109045
font_01_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 10312 bytes
SHA-256: c5daee69c8c43558c0a5222dd5f356bdde87cca1fdd42437529b28ffb7fc7d80