Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9c0b678a3ff28e…

MALICIOUS

PDF

79.0 KB Created: 2021-07-15 14:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cdf82554538bf92f36394f398e4dea3 SHA-1: 6b5821602546983a4514dd1fc399dd82ed871edb SHA-256: 8f9c0b678a3ff28eeee442a3487b3e2d55b203c1b7c79ede9f6deb5d9d8f368e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. An external URI was found embedded within the PDF, pointing to a suspicious URL. While the document body is heavily obfuscated and unreadable, the presence of embedded URLs and the high-risk heuristics suggest a phishing or malware delivery attempt.

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://feedproxy.google.com/~r/sq/ugae/~3/0YvHz_IItD0/square?utm_term=i+smell+gas+outside+my+house
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8d9511a746407a420a32/1626115477446/blank_nyc_size_guide.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e91e25787dde1a90ade2af/1625890341621/pdfpen_for_ipad_review.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8ee4e4ca3800a118888f/1626115812723/54909508235.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8defdc91b61347ea02a11/1625874173265/autocad_2020_exe_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca7cd5338e9546e4a980c/1626122189488/elementary_education_subtests_i_and_ii.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edba2ca777f115ab914925/1626192428728/98717740541.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca38a51a87c5d75aedb77/1626121098385/kedoxibefusuku.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8c7bc0c1002185597bc92/1625868220881/mefanomupevozivofe.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edfb98e6792c2552be1f46/1626209176226/how_many_quarts_of_water_make_a_gallon.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60efd1555d627c4551e097ad/1626329429689/monavexafajar.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60efced5c0b35f4fb3d8fc54/1626328789289/5342174584.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_off0000d4b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 16792 bytes
font_01_sfnt_off0000eccf.bin
6ef32dd8018bc692a66e0eee6caf5f575f1ed2a28c8999585bb2830e6867df6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 10656 bytes
font_02_sfnt_off00010503.bin
39d7fe75fdcffae51fc983e475fdb8c3a64c8c3d67baadbd12be2161d5e7cfc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 16464 bytes