Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeaf30db45768044…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 06:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8edc935ccc8dee8b5ecc291cfb4beaf9 SHA-1: e47d4900d19ebdedd4af668bc915f927c3cb6511 SHA-256: eeaf30db4576804432d76f4c8745b958f4bb16fc4f20607f0e3f9325b5f1a7cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains. The presence of numerous unknown URLs suggests a campaign to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://sbnjl.com/userfiles/files/55666890456.pdf In PDF document text
    • http://mebco.ru/images/file/giwerati.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/fivodixofo.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/72513020376.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/dosewatonotejekemovudu.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///ritet.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/wurukisenosuninofuz.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/vurixagemixoti.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/vatomotazorupurijifem.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/jafag.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/pokaxumuzora.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/88510436659.pdfIn PDF document text
    • https://masihpt1.com/contents/files/zotokuvexefuxiw.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48d16705e---14165011339.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/rupagejuxebokuvanupogoz.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/58760578830.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/rutepovez.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109060658089411.pdfIn PDF document text
    • https://mklaassen.nl/images/file/78967961035.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/jegebojutitevogolav.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/kijeko.pdfIn PDF document text
    • http://change4best.ru/upload/file/jujutozedumezutupij.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bewebaluvuwidu.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/42727884276.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/24806106158.pdfIn PDF document text
    • http://tdbm.vn/upload/files/67243805007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=launcher+iphone+proPDF 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_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 10216 bytes
SHA-256: 981aaf05bc5d78b7e53466a2bd4534db2425c6d0307bad9692c867c8a0542987
font_01_sfnt_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 21328 bytes
SHA-256: a73b466cd184a132e629c7bd82014d5c23094a1d601be07cc7a84403d96a89af
font_02_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1