Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84c104ff82cbdd3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 00:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c68a9357517ae8ace78059d0c33197e7 SHA-1: 49274679e909b21f3dd3a3ac1b18c3a084ba0bb5 SHA-256: b84c104ff82cbdd32670806cabda72ec92c616a60a28514d33cb5af3ba8f06e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://goodmix-psc.com/userfiles/files/mabukefunopomoriwo.pdf In PDF document text
    • https://adikkeempat.com/contents/files/34668449455.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xijazewizitiroraruziv.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/vufokusawoli.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210902_CE579630A0B5854D.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/fupufigajun.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/7735375792.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/85790240721.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/tedaborujuki.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/966637062.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/81036416512.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/28843904974.pdfIn PDF document text
    • https://partetesal.ir/data/file/gadonafawejozun.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/6993486004.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/68944890411.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/dewolo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vmg7goe0ir5vc1k8jfcu02muf2/92251128351.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24661717440.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/zetajeraxisanatefa.pdfIn PDF document text
    • http://builderall.info/userfiles/file/kutatoxitufamidodifiv.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/figixore.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613261c1c8663---35519264202.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/80853565085.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/birewazisubunafokakodenur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=messenger+not+sending+messages+androidPDF 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_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 10540 bytes
SHA-256: 86978cfab0272afefae14b0253e08bf57377a5d80bc06eb757f7b22955150a34
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 18276 bytes
SHA-256: bc75ca71c051b153e006114ce90c1aee8b92550c2d438395b7066a21e5c4701b

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