Malicious PDF — malware analysis report

Static analysis result for SHA-256 093e560894348dd3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 01:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81d712903c50caebb5548a81a7b88c3f SHA-1: 841d4cddce27e34364b2059eccfda5e5535b6725 SHA-256: 093e560894348dd3dd343fbe601812141f33d2a1af4d9b1829a065cd68dd91b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obfuscate the true destination and track user interactions, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16134919b259fe---14652020427.pdf In PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/lugekaman.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/5832390672.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/rupikuvexezowuzogavuzedo.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/82874302219.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/87635328731.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/bigulinej.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161442d8d58991---bakojadezalapumabanujakit.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/89227755695.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630490303.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/jarumulufawop.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109120924314514.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/fiwuro.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/79744107495.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/50043814248.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/5243620454.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/xuvifowumejunuzik.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/53172336985.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/84310421405.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/duwunopiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pvz+2+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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 9724 bytes
SHA-256: 892e76adf8ab907403160cac4ff7124d5ce4fe5f96cd01047932d9b3003d6333
font_02_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 17912 bytes
SHA-256: 29be426c87c0087eea658715833026b10aff79493e73b84a1afffd7dd8838d5b