Malicious PDF — malware analysis report

Static analysis result for SHA-256 88abe8059fa570c7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 15:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b59c3639a4f420d909aaeb005015b470 SHA-1: 5cc826937929dc8574298596062d8728b2fc8a0a SHA-256: 88abe8059fa570c7a2489776bfc8ab7a6ae418646947800aaaf030483d16d71c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV and an ML classifier as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to other PDF files on potentially disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://inwestorfinanse.pl/userfiles/file/fefopiko.pdf In PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/16864696284.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/91666022915.pdfIn PDF document text
    • http://canadianrockies.info/files/file/36674023447.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/9590701294.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/45968439765.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/82458220816.pdfIn PDF document text
    • http://rinsacars.com/files/others/63242802081.pdfIn PDF document text
    • http://stroi-sistema.ru/img/43408375957.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/10638976775.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b451eeee7ef24a0cde2c6f979ca7a6c5/muzezov.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/biruzusilavifuf.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/61408339991.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/kepelanimerajumofaxo.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/25156750559.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/tenanar.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/36224284474.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/fimal.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/91615757327.pdfIn PDF document text
    • http://belst.by/upload/file/ranisumupipot.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/kosobonetugipokire.pdfIn PDF document text
    • http://amandamaitland.com/images/file/99929887393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cats+crash+arena+mod+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_off0000b0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B1 15424 bytes
SHA-256: c797f40a536e36613d09e77dc8c3bf901a765ec6b9d5ac80e7ab3895881ec333
font_01_sfnt_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10764 bytes
SHA-256: 565569827ffd8e1e38986b9c67cdc09c28004bae3d28a8f0fef621f07d536577

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