Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d4e31842e711a6…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 18:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13e354f8dcc3753effec365051e957e1 SHA-1: 2773d53b847f56d4aa2f40b7ba6a529c8a4c1616 SHA-256: 48d4e31842e711a6c65e97c33e28e09cb12459e44d7c99be823910dc54726363
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm with numerous disposable hosts and the 'utm_term_redirector=True' flag suggest an attempt to obscure the final destination and potentially phish users or deliver further malware. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://lingeriedediva.com/UploadFile/file/2021090701243373499.pdf In PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/56347820675.pdfIn PDF document text
    • https://alohasafaris.com/files/gigukafumowogozo.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/94231606161.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/xamak.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/41306035555.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/96542798955.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210910_4DE9E67D91A1F3B1.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/1988986585.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317e0c0212b---devisekikakijemaxajutog.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/76181604297.pdfIn PDF document text
    • https://casaalu.com/luutru/files/mujafixanune.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/19674541182.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e5ec79f7---88493433840.pdfIn PDF document text
    • https://rippa.pt/files/file/mivuzaderorug.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/xinoleranikunak.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/rixeruz.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/53545921102.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/86204758233.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/43368279823.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/2615738504.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/49645909485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+block+email+on+android+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_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 17620 bytes
SHA-256: 4ad7c83dd4a8cb4deb0c492524ad4d52587a31428ea0194aa22bb6de60c48021
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 10920 bytes
SHA-256: 9812d4f9342d6310adf4db8e28eef399624924fa2b2c87add1d32b9455ec5c98