Malicious PDF — malware analysis report

Static analysis result for SHA-256 44335c5b774534fc…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 20:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 570fb0aa81c2caed7b4291f972ed5bbe SHA-1: 2a7b7744c52ae1538d0ade30a5b2398849426b83 SHA-256: 44335c5b774534fc6d58505aa47f0b13ff7876b1c418391f21a3d48429e13794
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 0.9951

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137823fed098---tutabolomoresafopavib.pdf In PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/lejabusaxizojawukives.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210920190131.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/nifepovunoluraj.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/fazagufekiziz.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/40924563591.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/potoperoxen.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/18692154671.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/vusixunavigopefedokofajur.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/35872033361.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/19940198097.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210905_52C9823BA09C284D.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/bozipubosedavukoveda.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/jofumedelegib.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/mepigir.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/65283508432.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/29962143688.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/dejoxogoriban.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/lipomuwenodovesifetazidap.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de073bf175---2916799533.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/jibokizikonobanubemamega.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021910344189535.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/zeragarepadajivapagabin.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/47028253062.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/47680435394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pdftk+remove+watermarkPDF 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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 10352 bytes
SHA-256: a4e8ca247196bfc7d13968d64373c222b4f270194c6732bf715257594a0f3b37
font_02_sfnt_off00010d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 18304 bytes
SHA-256: c7b32ee78721aa0847725ac18fad55072ff06dbb35d9e476ce6a7da8bf8a3191