Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c3822b2205f32d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 15:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3b2d49d056c882b8a72f327e5cd859c SHA-1: 91748e311b5f81807d291d4fa6ea76ff9b89c576 SHA-256: 75c3822b2205f32d76e20eab3b12f3be1994d611b58872ffe6a05d242eb54a9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=alfred+piano+book+1b+pdf PDF link annotation
    • https://extremedriveline.com/ckfinder/userfiles/files/75426299111.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090614251373499.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/20558802838.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/penudoveve.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/59898014227.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/41760003498.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/41386424706.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/84853728739.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/lisomamatama.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/mutuzesulawikom.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/65374409607.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5b44e196---tanirabunisigidowob.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/gozepuzuwawupizefeja.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/51509595675.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/98115007433.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/38067643719.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/zufisotanoxarabinezum.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/dagizelijezitakoxe.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/gipunijedaxusopoku.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/suvakenularevekotofudido.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/sosegikumunurajekuz.pdfIn PDF document text
    • http://dmkert.hu/files/file/rufavenesajepaxuduparubob.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210912215902.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/zodiregesofusojoji.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_off0000c8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 10492 bytes
SHA-256: 44beb0667c67158fc0eb18845a7b8a05fc370f9bacc2788bf6318530c3491d85
font_01_sfnt_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 17196 bytes
SHA-256: f421c18c3bf1f6d3f4e9637b21ba4501d62db36521aaaaf3f4f61247a67d5a49
font_02_sfnt_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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