Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1770a2304656c6…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 00:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe300945aa50420695f98a52d6067855 SHA-1: 8232ee31fa2c43a240363016abcc90451255e790 SHA-256: eb1770a2304656c68fb3f1684ea50673cb96ebb60abd7cb9d1e60cf22835fc13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=quantum+physics+engineering+1st+year PDF link annotation
    • https://krainaogrodow.eu/zdjecia/fck/file/76136680006.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/69929806886.pdfIn PDF document text
    • https://yodobashi-church.com/92521773107.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/kapuxemusinena.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/gilidajenilirenaxis.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/mikiribapa.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/pasobinozavexogawil.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/37732195820.pdfIn PDF document text
    • http://sarafis.pl/img/userfiles/file/65408411698.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/sovezeno.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/agghi4v1m3gp1nm6v30nvr72sm/watifalamupel.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/69074065283.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/41583225907.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/84791997028.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/gotulobubolemedopuw.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/63270417066.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090519570714.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/fowej.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/89202905403.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/10560561461395f264c6a5.pdfIn PDF document text
    • http://djpress.pl/Image/files/36997549461.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/64233681596.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/71232095717.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/razipan.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_off0000af41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF41 16228 bytes
SHA-256: 18183c0860b57b088ad3fa479dd565b2b8a70bb5521ea7926423256e3276c78b
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 10980 bytes
SHA-256: 1761755e06e1f5799a528aaf500d2e88cc345f87b4eefd212b34ebc00d9f67ce
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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