Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec93c64f120cff62…

MALICIOUS

PDF

79.1 KB Created: 2021-07-16 13:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff2897e78a547232ab1c9fc0c9f899ee SHA-1: 79acd16fc5ea0b2a40754855c6fca21ef8e1e684 SHA-256: ec93c64f120cff6215542fb739fc025398007e0b4511e22485a03f270bb259bb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs, one of which is a Google feedproxy URL that likely redirects to a malicious site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external URIs suggests an attempt to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself is flagged as suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://feedproxy.google.com/~r/sq/ugae/~3/v-xubMviL4Y/square?utm_term=5+kg+to+g
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edc0e6ac614e13d12ce5ae/1626194150310/commiserate_definition_sentence.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8e060e7a3c5fba3e4196/1626115590438/jogogim.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee91ef2af4c0197801447b/1626247663901/blank_tugboat_that_saves_distressed_ships.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e937fd2dabf272355526a5/1625896957543/jamefoledadodilu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edd02eafeffb59e6706ad6/1626198063003/26597944110.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8efeeb132fa362070fa1e/1625878510391/english_text_book_of_class_10_cbse.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e850c53e18c826700c0ea1/1625837765856/shaolin_temple_admission.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee50b15f7927514e3e7f10/1626230961910/tovafawixusiroduru.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e961963ba7d954d547ff95/1625907606362/xukosutetexufevid.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7b3eb25441e1b3783fc9e/1625797611377/written_reference_for_rental_application.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e82d0969e16759cf78e938/1625828617333/introduction_to_systems_engineering.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda019a73a263c31e099e9/1626185754914/shadow_fight_2_titan_mod_hack_download.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f11e02311eab0d81abacf0/1626414594221/vaxifu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60efe75790ddb31b72a6dfd5/1626335063508/rutexalepug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 16792 bytes
font_01_sfnt_off0000eef5.bin
cda12dd3a6e0ac632520f28606934e741a190f1a7c0485de1d30a78f3d79d3af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 9608 bytes
font_02_sfnt_off000103e0.bin
45095d41c74b1ab73d8ddb2e21c236a125204d8b5969049b598b16ffb0c3475a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 17416 bytes

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