Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c87de6e380bbfd3…

MALICIOUS

PDF

81.3 KB Created: 2021-07-13 14:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72b1fea6a5f39e357b3050b29853f0c3 SHA-1: 3e174047e3bdc10486165df28894d8abea5ab926 SHA-256: 5c87de6e380bbfd365bc34d5ba21f7d0b66f64320b20ab44fba220bbf911750b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier also indicated maliciousness. It contains an embedded URL that leads to a suspicious domain, likely intended to trick users into visiting a malicious site. No scripts were extracted, but the presence of an external URI and the overall detection profile suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5948

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://philabc.ru/square?utm_term=physics+class+10+chapter+4+notes
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e1ed27127e68041263ea/1625874925591/whether_and_if_difference.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec77f331b0b43e07e5a295/1626109939900/do_not_take_it_for_granted_meaning.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e61c8b0d544b6d713da/1626111585578/plants_vs_zombies_2_unlimited_coins_and_gems.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec86dbdd2ac847ff7eef03/1626113756211/zufuvu.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8fc03566ded7d61ab5b26/1625881603701/lexuwuvaponotuwapa.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c749.bin
97255d27b4fdcc2fda4709d36486837d5087c548798e6d53b906e4455a3b90c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 16124 bytes
font_01_sfnt_off0000dca1.bin
b4704b2ae53a6f8a7c99fb63c300c9f5f33de7c77adfaecdefec1cb07849bd1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 10836 bytes
font_02_sfnt_off0000f5b5.bin
0006c90d246fd711d0819a5074083b4fb8ebad434a276b33ff5513d2fc08396d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 16832 bytes
font_03_sfnt_off00012103.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes

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