Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f97d39810c2aa5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 17:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ae21b0f832697c463b56f3dbe1889c98 SHA-1: 7a0b846ee559edd157666b9ba5234d4c594acbbb SHA-256: 29f97d39810c2aa59a3c4876a7994bd5ad26b459bec89af078bb75090f783c71
126 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, many of which are unknown or suspicious. The presence of 'utm_term_redirector=True' suggests an attempt to obscure the final destination or track clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://theurbanthinktank.com/files/defuwiki.pdf In PDF document text
    • http://webs123.com/userfiles/file/40719906159.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zasadota.pdfIn PDF document text
    • http://keyday.ru/files/files/wasusuloze.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/zogoni.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/begasa.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/0t345o24re87f07lltthlhfil1/fizugivuboxewuruwakaw.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/20399553397.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/24947351887.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/gitesabuvaja.pdfIn PDF document text
    • http://nktrading.qa/file/files/vuzonazaliwusu.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/jilujufu.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/kuwudetom.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/nafaliragifebojipeja.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/17535843206130db73c4e2e.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/14645651789.pdfIn PDF document text
    • https://goodline.by/userfiles/file/mapam.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/16624503693.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/41840936393.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/59527454707.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/84855861260.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/mizoxu.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/siwebugimafu.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/fedejorafomesofus.pdfIn PDF document text
    • https://doitoutdoorz.com/file/TbhvEW95Xe0kmjUE.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/natategisubepurazobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sql+programming+app+for+androidPDF 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_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 17880 bytes
SHA-256: a4a44e843ad41a5295bb788c8522aedf52d3a7d7e02ef6f84df76354db87e897
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 10664 bytes
SHA-256: 63ff5390973ceb457d5f4a972d46af6498ace47559217e0550bd539f0c3c68f8