Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30a5c3eb7bb5f05…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 06:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a5509916531b6f8c4b579c32ef6bb5a SHA-1: e4d9dcc045e12b37ac19af679a50203dbc59a14a SHA-256: f30a5c3eb7bb5f0590db27a5436c116fe9fc9264579c5c8bc203e519dd3a6ba7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly indicate a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=ptv+sports+live+apk+free+download PDF link annotation
    • http://kiddeefire.com/media/userfiles/files/81870360899.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/rawakogogo.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/33570339254.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a3b7e92e---67998098193.pdfIn PDF document text
    • http://turnyras.lt/Files/file/ropiwojirogetogorul.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109160216324224.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100612408130.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/sopabe.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/dofawomip.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/mepozojelirivek.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/14318492385.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/35132050645.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/dejewovijebojo.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/rovamafojituvorojepagema.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/2428295345.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/kanaberulabigala.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/jiferajenepoxilusez.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/60576059377.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613561d24c37a---18802844938.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/43849110225.pdfIn PDF document text
    • https://emmaushuis.org/pages/42379384787.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210916082129.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/xezudamizav.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/10131595416.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_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 10736 bytes
SHA-256: a08b511cf61076701775e77868020ee4c95bc9815e4418f9f1f924997d075aca
font_01_sfnt_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16884 bytes
SHA-256: 76358d12467ac131000d7dd75dc13e07286f6cf49fea89fe24e053a4c6eacfe2
font_02_sfnt_off0001174f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1