Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dcd50ba37d8efc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 17:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27c2b6b89dd8a80ab7081bb11e060076 SHA-1: 1ed9fe27467f3a1dced290f0cfbc5a5a30bf6014 SHA-256: 79dcd50ba37d8efc456d56b43d99b264daaa4c2dc8a52d5972ec0bafce435fe1
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hoangmailogistics.com/asset/site/files/fukivaxixerufudowere.pdf In PDF document text
    • http://sanfrancescovet.com/userfiles/files/fulidugupodiwemaxop.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/24053599242.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/10179754370.pdfIn PDF document text
    • http://dothi.info/images/files/bawirikesufoxikotomumokof.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/natesibeviriru.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/23370229939.pdfIn PDF document text
    • http://boldogelet.hu/media/luguz.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/14370200322.pdfIn PDF document text
    • http://bdn10.cz/files/file/mavafilodibage.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/sekozijifexete.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/84218522948.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210901_05A28F171636F036.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/koxusukaxolul.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/50901003059.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/3986734243.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/3047405542.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/2065263521.pdfIn PDF document text
    • http://espokebar.com/uploads/files/sivasezoxokikudubiropop.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/jesofifagin.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210914013313.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/gatefigusojizos.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/sixezanalevidexegagu.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/87663490473.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/dufeta.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/68744096119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=estadistica+aplicada+pdfPDF 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_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 10140 bytes
SHA-256: 6efdb477d59225a70b95349e29102f03a6f35475f58c6455edfaaa9ce196cee0
font_01_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 18612 bytes
SHA-256: 8a563f67a500873aba453a12aa29b67a8b0bf886cfbecc8d6ea43bc0b13a6e9a