Malicious PDF — malware analysis report

Static analysis result for SHA-256 802b0539deb7015c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 20:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dec5cf8f7450cf08a51e09fbf7b371a9 SHA-1: aca3693903a20c31b509324dc0c2080f5babb199 SHA-256: 802b0539deb7015c476361444f0b3afb17bc4513b13e4e772cdd241d9a2cee30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://movie2book.com/userfiles/file/losoguwodudasenalimozalap.pdf In PDF document text
    • http://infracsap.hu/files/file/69346211142.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zufarikovudoto.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/66964802753.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/genigegugired.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/56775421920.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/66924841831.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210903021553.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613278950cc0c---30070711960.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/31693761141.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/mitoxifejagedezorajipiker.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/32860238229.pdfIn PDF document text
    • https://e-midas.ro/files/file/dewejubojedurufajafegoj.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/93322283183.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/32082022069.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/pujilu.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210905_F6450512998C063A.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/gotaporarakimizobinajefo.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/41174495578.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/45172621425.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134341088255---nepagajojipapoj.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/24214105729.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/naburetalarozuf.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/kakunumaso.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/42934916939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=widget+smith+apkPDF 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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 16948 bytes
SHA-256: 788f594a3f63685e445958ba3bf318000f7149077e56ef2daa66fbe21f80c097
font_01_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 10556 bytes
SHA-256: 999f3c85c659c233a6f631e19dbee1d2bcbc04b99a2c5f02fc2d714d2a3a3a34