Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5f6e1d379a8ce5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 01:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: eaa26d325b607a37898e8fd14f17393a SHA-1: ae05389c9b8663f06237d6195d0678d7dcf53259 SHA-256: 4b5f6e1d379a8ce5aead9b90929e74b77b63220539aafde3ee87d9c5d1ecbcbf
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 0.9981

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://argekaucuk.com/nbg/upload/files/mezibaruw.pdf In PDF document text
    • http://villabrown.it/userfiles/files/28128695311.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210912213815.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/39079871542.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca34cfb25---kejokot.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/sizogagevuvuti.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/vezetutivewumuxufazoru.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/zozokuvijiribafibe.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/takagakad.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/19257289068.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/muwokuvopojoduzewo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/gabajizisuxom.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/fabuwosajulovitonej.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/zumofagenetudifariwepap.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/garatoz.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/jiziludotabesesivid.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305b8a0a277---mewijuroxasamaw.pdfIn PDF document text
    • http://hbaoge.com/upload/files/10843522265.pdfIn PDF document text
    • http://friulanapanini.com/images/file/12506443985.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/lujizoba.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/bonukesununasoda.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/56885030718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=definition+of+focal+length+in+physicsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 10772 bytes
SHA-256: 3b68b62ca5198afc20c5dea3d6ec13379f82ea110553e50308d8ef9b971b0e87
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 18252 bytes
SHA-256: 7047d8cdc688dc881659298d9e054d1f07f7548a8fe7f7e73ad886a50be1d40c

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