Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1722381e17e2cb…

MALICIOUS

PDF

107.0 KB Created: 2021-09-11 14:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8c71c4abb5f32b47d8604e54b8d5569a SHA-1: 8ef6846758b6d0ac3df167c2423fa039990ccb2d SHA-256: aa1722381e17e2cbcad1a2d388e0a1154666a8f0b55e1756b5116fa9e4167883
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • 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://machinesupplier.cn/data/product/file/202195_231333_619.pdf In PDF document text
    • https://strongpointmarketing.net/userfiles/file/wisopopaf.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/5852826014.pdfIn PDF document text
    • http://sun-eko.eu/files/file/sijalisilekirijevomezapu.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/47158901012.pdfIn PDF document text
    • http://beiks.info/public/file/xesegule.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/20850808812.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/39831871410.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/visunaguzewuben.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/xabisinanapobewojez.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/zujibovalupex.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/85549870738.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/294ecb93eb341e64fe6ac4a127821e47/92633463697.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/25535974277.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/fezakoxizimexefewogosen.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/18698290292.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/kegaxis.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/13144605545.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/8722785313.pdfIn PDF document text
    • http://mutitar.com/user_img/files/1334649403.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/rubedugoralejivuk.pdfIn PDF document text
    • http://giga.sk/storage/file/82607568435.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/wafemuj.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2eda477b2---lonoseboxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=silang+postal+codePDF 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_off00013db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB3 18976 bytes
SHA-256: 15ec34c76a51bb63342d16c907a3d842ebaffb70e7d3f4b053ae33c8dfd42d50
font_01_sfnt_off00016df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF8 10664 bytes
SHA-256: e4ea88bc6bbc11031edbe3aad03755b87782b46330adbb4b4734268f0bfc3cfa
font_02_sfnt_off00018647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1