Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f992b3aba9b1abf…

MALICIOUS

PDF

84.0 KB Created: 2021-07-23 00:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee39aeb13ffd490c6e1c793494da6ce3 SHA-1: 6ac692608baa9dcdc6e17eb4957ab40becffeadf SHA-256: 7f992b3aba9b1abfa08e14e838d50a2f330c76bee5c0f6f84782df87ad35763f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An embedded URI points to a suspicious domain, 'crewmak.ru', which is likely used for phishing or to host a malicious payload. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/square?utm_term=certificate+of+employment+until+present
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f2982929712869f05e9e37/1626511401312/good_drawing_pencils_for_beginners.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f526e0aba5f52989bed5c5/1626679008298/funny_racist_mexican_jokes.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e76d62ec06872a47a45b67/1625779554951/vujofimulezinugepew.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f37c2f3a33e4096dde1e5e/1626569775665/36880534532.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1b820b1e1c12c9b8f9bea/1626454048615/fikuwonunagunaposup.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f49fee730b252c8823de45/1626644462308/what_is_the_difference_between_a_bb_gun_and_an_airsoft_gun.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f358a57e0b4d5f6b1b5b56/1626560677825/asias_next_top_model_cycle_3.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f54d97ac7784023581fb2a/1626688919971/jometewudumejibofadosu.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1ff9da7741909b312e346/1626472349747/papeete_to_lax.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f5be762a313a24eb925145/1626717814356/70634367343.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1c0a71c4ad82c2b0a068f/1626456231379/42205563209.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f9dd27ef7e6a0ba572c91d/1626987816070/baby_trying_to_sit_up_at_4_months.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f71eedc9ad617a67fbf115/1626808045729/minecraft_the_space_age_mod.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecacebe7718717d765f996/1626123500050/ares_file_sharing.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f28e121ad9bf1c32abd832/1626508819005/pojolaxodirememaj.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f14bed6186c43100449cbd/1626426349489/40728517723.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f034d37fedc2490c0d1837/1626354899875/college_physics_lecture_notes.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca1cdc81c37306b319b29/1626120653543/where_is_my_income_tax_return.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edc81fa0f2ca3483cf80ed/1626195999993/we_praise_thy_name_oh_lord.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efd104cd1cf129e1619169/1626329348113/crisis_incident_stress_debriefing.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f7c1e57fa2f330f684993e/1626849765159/26739534848.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f9e45cbaca17549989f8eb/1626989660392/mixed_numbers_to_improper_fractions_worksheet_year_5.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f918e0aa10666fbeeb0364/1626937568675/nuxavik.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_off0000e3f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 16792 bytes
font_01_sfnt_off0000fc04.bin
0c996f840290dcf88bdde894cf25d075f5927949ee514ddecd8b36616e02d22e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 16896 bytes
font_02_sfnt_off0001282e.bin
cce795039169249f6e44d9bbc5df1d2f683b7a5db81ade3bcfd16965a4230098
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 10888 bytes