Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b7c8f94cdfe085…

MALICIOUS

PDF

88.2 KB Created: 2021-09-14 05:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24299d530ed50c33a32f5d3322554d3f SHA-1: 1013d42a45b5d12cbb7c5738c5535b80bfb1dcd8 SHA-256: e3b7c8f94cdfe085f1be2faf5526ef8693821f6c8ee19480ce87ab1a4e7e6ad8
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files hosted on various domains, suggests a link farm or phishing campaign. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick the user into clicking a link to download something.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hanboo.cn/Uploads/file/2021090213573070554.pdf In PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/26396468178.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e0bc1118---dozibasufixotafuv.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/4171861800.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/torixofuverififoji.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/63767202677.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/tefene.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/92457299945.pdfIn PDF document text
    • http://shopabrang.com/images/files/94120431550.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/91504382661.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/gululixizorunakusawinitot.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/30414857450.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/tivisusaku.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/98829475575.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/65149987222.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/konowu.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210903125543351.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/99034692846.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/dasisotosi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/38213122068.pdfIn PDF document text
    • https://citronel.com/userfiles/files/tetorenepex.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/dumajuzurupexafimi.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/71189460068.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/bejupug.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/76981206130.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/90370684746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+tcg+hack+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_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 10508 bytes
SHA-256: 64cc6cab0472efd00f1a280cb0198eade89ee2a6f91c9599a4bed8fa3b3aaef3
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 20468 bytes
SHA-256: 05e842d1b9cb4adbeb65e3a33d15a446e4b70041ff8179945d9200a9b87b916f