Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae36e198e1a3ca37…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 10:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43a4358eac0459cf950b400975d63bbc SHA-1: 9ad1e1ab3e53729ea9a98b1957610be481bbc1a5 SHA-256: ae36e198e1a3ca3732f01a1e3ab04755fd99d248bf598ec254387847e139020e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially disposable hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cmuniontravel.com/userfiles/file/22630803701.pdf In PDF document text
    • http://2222.netsociality.com/upload/files/tilolivixezeru.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/gipekeluwepaderarek.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/judikalobifetuxavetupa.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3dd27e64---fujafudikexupikofiradaz.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/11598868571.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/65185753320.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/mutunikokor.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/rufade.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/31304949158.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/xowopixuj.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kixopozazugiwig.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/46844479015.pdfIn PDF document text
    • https://rintrans.com/files/giredu.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/mowakugexinakuka.pdfIn PDF document text
    • https://petikdaun.com/contents/files/28238578559.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/paniki.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/denodudorazanijomiwo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6bs8vtk4qij9544q84p10ptnh4/muputonusufawibexami.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/dikete.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/setovarazepumom.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/71922251733.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/nofodojevipinanamena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+dark+purple+with+acrylic+paintPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/84927352031.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_off0000d358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD358 17832 bytes
SHA-256: 8ca4570eb13aeaf71f780f4f2912e57d99798456ffd4d0708476e7b5a46110c4
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 10996 bytes
SHA-256: ccea10ae16abcfec2e5c7851847f50c1a47a9820ee2cc516fc66243b28521ae3