Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68da6d2f22b65f7…

MALICIOUS

PDF

95.2 KB Created: 2021-09-11 17:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a4414dda2b55409cbf5901754351b21 SHA-1: 049d9a33fc26f0f1f191c598fc76839b43e6141a SHA-256: c68da6d2f22b65f7d3590edfe2c5f0e6f0586f6fb53bae0ac36c2b4407cfc6fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one identified as part of a link farm on disposable hosting, suggests a phishing or content-distribution scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://crewmak.ru/uplcv?utm_term=middle+class+during+the+industrial+revolution PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfcaaad695---gikifuvavepukumujav.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/1526560041.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/88423934024.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109040659476047.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/55086049172.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/69925791126.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/72606373756.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021911142591782.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/vipujuzinozigonoxo.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/46433309307.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/lotaj.pdfIn PDF document text
    • https://actor-conseil.com/files/file/linezikek.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/96658875912.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/pakelozunazasuked.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/nukefukixek.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e9f6ed0df---juvoliwixutofajo.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/rerirowekalojigu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/91131723373.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/xudizeviwi.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/giwodijulolapasud.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tadobobujovifuvudiput.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/vugepujirarajodoluwiga.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/48448357899.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pusizedoberuniwa.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/sajuxuwibaxibukex.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/mebej.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_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 17696 bytes
SHA-256: f272a6a54eaaab5ac540289dfbaf8481bcf63a5537b882582e5ec997678d1981
font_01_sfnt_off00013e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15663 10808 bytes
SHA-256: 11b2a2a28bad187f7b1ebbcce825c9a353cdf21de835691569f66c5b81873ca8