Malicious PDF — malware analysis report

Static analysis result for SHA-256 850a02d189918612…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 22:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4549e2af8cd61364bf00b46ba9e00e9d SHA-1: 3c9697174da2d4dffd645f8e26983b214db9525b SHA-256: 850a02d189918612cbe3d98cc6f469318703c6da05860240da0488232c6ea080
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one that appears to be a link farm, suggests an attempt to redirect users to malicious sites or download further payloads. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=minix+neo+x5+android+update PDF link annotation
    • http://jyjwqj.com/uploadfile/file///2021091309043337.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/89419939277.pdfIn PDF document text
    • http://zimmerei-possert.at/4428430164.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/57246102921.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/65088330057.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142777a764a8---pelevujogimetinog.pdfIn PDF document text
    • http://xhzhengli.com/upload/dikifetegozamo.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/62066632116.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/sawisivatu.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zibom.pdfIn PDF document text
    • http://getvisa.ru/images/File/xuwazozemurodusob.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/tukogor.pdfIn PDF document text
    • http://biomehl.com/images/content/files/zatonulumebamoxes.pdfIn PDF document text
    • http://skene.es/userfiles/file/moxujovuni.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210910174637.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/sifur.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/malavak.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/82287018362.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/wofimakunulifotenuza.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/butowapexatifaza.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jiuc397uieu6jo62t4vonpaiis/76666533336.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/xawakevibolavuf.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/89734296337.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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 18996 bytes
SHA-256: aaa0fed70ae3c391c4b3171ee8b89256078d3bb0edb8dd39c8ac36822cf2966b
font_01_sfnt_off00011234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 10500 bytes
SHA-256: fa538b15cad1de185b593e4372db59badd94f08b429482ef25a39bef7ca224cd

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