Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab53f3584321045…

MALICIOUS

PDF

74.2 KB Created: 2021-10-03 01:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a91d90b18d615636a2f9637ff163920 SHA-1: 2ad764a0c80b0b99df4e437ee6ee6b0953146695 SHA-256: 6ab53f3584321045deee6dc457d071d1e82bc2deadef8f6d33293c94b8516d1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'implant-drill.com', a domain associated with malware distribution. The PDF structure and embedded content suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://implant-drill.com/userfiles/file/vikigojanafi.pdf In PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210926232028.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/85866621288.pdfIn PDF document text
    • https://dhesient.com/media/67681904006.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/38953491150.pdfIn PDF document text
    • https://12shio4.com/contents/files/farod.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/11711712778.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/33274279225.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/99185106070.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16158842889f8c---77298899824.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/37077509215.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/zugujunorivulo.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/zujexolepipumigowegariw.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/nagegunikujupaze.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/61523692398.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/3231672211.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/50271680207.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/24653591235.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/62823322958.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gijovubukamopoposova.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/sedejixoxoxupov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=generalized+linear+models+mccullagh+pdfPDF 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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 11168 bytes
SHA-256: b021516c860001b2d7250fadffd5e09fc9f32c58a8da0fdfc86d6d85b2962669
font_02_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 20164 bytes
SHA-256: 3011d60750a71ef32963a4b7198edc8c4760497f65508b24296060a25e189d2b

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