Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4018108f0f2d902…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 05:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d6b1230f14fa9827c46af4de3f4082c SHA-1: 5a1a3cd80a424f6a7b31d144ad6d3bd44f05a9a6 SHA-256: c4018108f0f2d9024304f8f65d0e3a436f6178ca045d7ad9dc055a2b59c88123
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://prunay-en-yvelines.fr/ckfinder/userfiles/files/81495637459.pdf In PDF document text
    • http://elverum-revmatiker.no/images/file/78342835838.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109071535103839.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/duwagibufejidame.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/781199587.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/33703131691.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/25620794494.pdfIn PDF document text
    • http://uco-kampen.com/media/files/50894797467.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubotuzajekibabelojamoj.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/timemunoxewimanuxoje.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/73282021210.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fabc3ae9c---rorekilevawepobulomidi.pdfIn PDF document text
    • http://modern-pro.ru/files/file/8521974413.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/85934375945.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/fesezimapadutekifodid.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/temoxazuvonefezipigevob.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/sujavud.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/zezibifegerezozugawokup.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/tujexi.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/29718889696.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/23953750950.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/zumavala.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/30680039883.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7138aa26ddf79387a7db845b3c872c5a/18862891186.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/47427474476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=perfect+viewer+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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 18004 bytes
SHA-256: 68c91c2876b41e65a97de9d0e029748cdba8f3ab768494d36acbf278203133b7
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 10280 bytes
SHA-256: f8a856dcf833e4888153b206f968af2be8a23cdfd75d50d0ed2869198918eaa6
font_02_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1