Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28d4dda15553086…

MALICIOUS

PDF

88.0 KB Created: 2021-09-10 10:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fdc500a17252e22bc8ef657cb0a0e0f5 SHA-1: d94df8a0f5221097c79a8f8f851e8e390972bf58 SHA-256: e28d4dda155530868673d7a82675f0d9e6e0d13d28e20eaa74aed7dc9adaab66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to a URL containing 'minecraft+mod+android', suggesting a lure for potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates that the PDF is designed to host a large number of links on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=minecraft+mod+android PDF link annotation
    • https://anandamsanyal.com/userfiles/file/54933644401.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/90089816371.pdfIn PDF document text
    • https://ms2oke.com/contents/files/99551301987.pdfIn PDF document text
    • https://signika.pl/Upload/file/mupodujisixufavasolefube.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/14369300891.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/26940813247.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/43551876135.pdfIn PDF document text
    • http://www.moyekolodin.com/files/boposabowamafugu.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/38343500691.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/dororazi.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/17412918674.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/39336498027.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/9393941329.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/27680689783.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/19207516977.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78771642444.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qcqjarrs179qdiirls997nbvk1/rupazojiduboxawotineji.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/75658454879.pdfIn PDF document text
    • http://ranch.pl/files/file/ragesudodotezizozekaroz.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/32487481629.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/widaxosa.pdfIn PDF document text
    • https://tl-systems.hu/files/files/gelafarilexukukaze.pdfIn PDF document text
    • https://chp-travel.ir/data/file/matubojeli.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/56018419804.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_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 18640 bytes
SHA-256: d2b0dfdca7badc6b38cc9219a9f226574b462953c0228d0b7d95e68ef8487c07
font_02_sfnt_off00013af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF5 10416 bytes
SHA-256: 21db6f8de8ddf75767ecc3336cb155a2f48647b18b5054b5281800e009350dd5

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