Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a27fdf7b47db18…

MALICIOUS

PDF

71.0 KB Created: 2020-12-16 14:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4bae6692902b5ef56eff7605bfb2cd4f SHA-1: eadaf5c8e633a7d7a8e5dd4a716924030bd137fa SHA-256: b5a27fdf7b47db18a5de9916098c327cdf5924ed4cf79db34d6e6e8eaa778c37
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'https://traffset.ru/123?utm_term=langston+hughes+weary+blues', which is highly suspicious. Although no scripts were explicitly extracted, the presence of an external URI in a malicious PDF strongly suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=langston+hughes+weary+blues PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7be794c0-11cb-467a-8a3d-0482c7d05269/whole30_program_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/ethical_fashion_guide_uniqlo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62c3dd9-daa8-46e9-bd9b-8cb766510d4c/bluegrass_mandolin_chord_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/masewujutewirup.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/dovereliwafogi.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/wekigaveximirudutisu.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/32884409605.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/terirekafavul.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/gatosewosisoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc51e869-457f-4c10-bce2-b52cbe6a3891/beta_blocker_global_rph_conversion.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6684c116eb00e3c71b053/t/5fd71feb13a48350e82b1cb3/1607933933308/14548008523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332be505-a0cb-44e4-87a6-ed40444f055a/putorubusoralalixu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c24e9955c744b5542bba/t/5fc803a092edec3c91f32408/1606943650948/samsung_clp-_310n_driver_windows_10.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 5056 bytes
SHA-256: 1cd844ad6a2c3530fea7e56f752dc794bc3c88ca94a7f0aab60a16f1f1eee11a
font_01_sfnt_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 10652 bytes
SHA-256: 8ecd316661e7b79df03d69c0617999d3856701f645db1f394fc271c1c9916bc4
font_02_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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