Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd96af437a5bf8b…

MALICIOUS

PDF

67.5 KB Created: 2021-10-04 10:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb2e255a70b955e1e326c265ed84ed6c SHA-1: bf4cf041743f71f1f3c0096921967f131c7335ac SHA-256: bdd96af437a5bf8b05454ad7f3975874184183737c42cfdd976b4e576881ad9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://catamma.ru/uplcv?utm_term=forte+84+south PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161461b0232802---30186083532.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/22811379810.pdfIn PDF document text
    • http://akademibt.com/resimler/files/wowokigexivekafanaluzut.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/6751003560.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/fotor.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/76525748770.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/sagiwulanasujefajegofawim.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/87379319579.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161424e92a5f36---dawemidumoxotasinevomuz.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20211003033440.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/96818429745.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/28434750157.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/73336186823.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/78256510943.pdfIn PDF document text
    • https://pt-olympus.com/contents/files/nevizivulu.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/6538782168.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/97612498520.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/vuzewitejujenegigu.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/1684447162.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lesejuji.pdfIn PDF document text
    • http://nemochem.cn/upload/files/gufajuxemikexiw.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/58375677587.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_off0000acd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD5 14728 bytes
SHA-256: a24343ec139c0d0fb351e835d1674c4dc3595bcba9c9731cce938b7bbb690d19
font_01_sfnt_off0000d20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 10164 bytes
SHA-256: e698fcc4c3bfee5bef24736cb2adbd96ae807bb8e90e8425554b9904d0fc2802
font_02_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1