Malicious PDF — malware analysis report

Static analysis result for SHA-256 850e8e2e77f1040c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 02:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a9f748e253a5d7f86a901186fb2bec4 SHA-1: 60b9caea0c6caf88bdf936a6539083105d8ce8fd SHA-256: 850e8e2e77f1040c02b712405c485c0233933fa54ca8dbbe39d1658c3110f6c2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains and some utilizing UTM parameters, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://laborke.ru/uplcv?utm_term=top+firestick+vpn PDF link annotation
    • http://qataminational.com/uploaded_files/userfiles/files/regepakuzobupufugiti.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/16629994068.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/bixixowofibijitebedasew.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pomizarebinibone.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/beveramewurezijiwukudeg.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/genewo.pdfPDF link annotation
    • http://fratellibeninca.com/images/file/nazozijenunopapeja.pdfIn PDF document text
    • https://avela.md/userfiles/file/rupusezajuxilotozekojo.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/99060623167.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/9258538936.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be900f6aa---75752478395.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/69724113003.pdfIn PDF document text
    • http://charontrade.hu/data/file/kokutojaxiwarutapuwixalif.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/10944233628.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbe537544---34297794886.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/nozelusulaf.pdfIn PDF document text
    • https://camphacement.vn/upload/files/zopuse.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/20398240576.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/koxulanida.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210907202436.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/69123243127.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/25291325780.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/79998657219.pdfIn PDF document text
    • http://interstudy.net/userfiles/file/29329769597.pdfIn PDF document text
    • 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_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 10384 bytes
SHA-256: a37385f4c41cc92730aff90078d703a4c7c81f725fb89b7f0b820c7142ea9631
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 19176 bytes
SHA-256: 578df22a5b3d09517f18db6ca3addcedea64522168c6d85c1e229b7b826846b4
font_02_sfnt_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1