Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c98436462b08dd…

MALICIOUS

PDF

81.3 KB Created: 2021-06-24 07:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 008883ced51645d5ce869905f58e9e92 SHA-1: d30ac082ca7e9683e14f15b24042f980f0020982 SHA-256: 40c98436462b08dd001c8d90e4d2be5bd30bbd93ad49d953330fdcad70d23878
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of multiple embedded URLs, many pointing to suspicious PDF files hosted on compromised websites, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'Stephen King different seasons pdf' and 'wkhtmltopdf', potentially used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f59d931bb5---55597258033.pdf
    • https://acronimocostanzo.com/userfiles/file/29064933733.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607339a146752---zadovodetatanuxajuboluja.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b168803a---riwupibivuk.pdf
    • https://volnynaklad.cz/data/file/32713390164.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fd88b9c02---52232525896.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bo7m29ju8p9igap6nhqqb9o5m4/5386495792.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bc83cfe4a---82778784015.pdf
    • https://plentis.eu/ckfinder/userfiles/files/nojuzagasagugazolegowi.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2ocfv98nke38okuf53jb1f9a0a/6325305351.pdf
    • http://goldmustang.com/files/files/lubejalotuj.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/10739663993.pdf
    • http://stinpo.com/ckfinder/userfiles/files/90548623561.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=stephen+king+different+seasons+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b7.bin
a994d946e1a4a6618ca4c67fc195508d85abf2a2f7505013e80d87a7b849c06a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5224 bytes
font_01_sfnt_off00010271.bin
aeef0ae571113d97a55e476167d543f6d153ab5daa7f6f96aaf8d17de8bd41d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 12124 bytes
font_02_sfnt_off00012a60.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 4324 bytes