Malicious PDF — malware analysis report

Static analysis result for SHA-256 397689e5d7b5adc6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 10:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 93ef832049a4f9f4c46856f49583fc91 SHA-1: 2f9d3676df86235a451db8245ed4ed4060bebcb3 SHA-256: 397689e5d7b5adc6f7f14e46eb50210a7dc352e77ce946eb4e4f3b9560f7397a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/wix?keyword=the+originals+screencaps+season+2 PDF link annotation
    • https://cdn.sqhk.co/wafavalufa/ibdjghb/purevuzinonajerodezinol.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/eNcD7B0/65489642863.pdfIn PDF document text
    • https://lipigilukezi.weebly.com/uploads/1/3/5/3/135347924/vabimifiwamuxosal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_6050f057b7175.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/lNHhiij/real_cat_sounds_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/jgjc3gd/fuwawiguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_60124fea199c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446646/normal_600a5d0c9026d.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/ig3Jxc5/dujumimuro.pdfIn PDF document text
    • https://sefelitajirowa.weebly.com/uploads/1/3/0/9/130969992/nobegexexuduk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_46c4df1a298f442991ef0c963273b09a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/ascential_plc_annual_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/mpsc_forest_pre_answer_key_2016.pdfIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_23a97ab754d545b1826dcf15b506e359.pdf?index=trueIn PDF document text
    • http://dilalixurapa.epizy.com/free_shutter_count_canon.pdfIn PDF document text
    • http://gokevoluwizob.rf.gd/konoxedevugalubevesaf.pdfIn PDF document text
    • http://zemipajobo.rf.gd/case_in_point_book_review.pdfIn PDF document text
    • http://vefolavasetana.epizy.com/calligraphy_lessons_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/advanced_excel_online_test_with_answers.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_696637e7a2224ddaa06465cf4d955e3b.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 5276 bytes
SHA-256: 7d86c837b4221e9704d83267b5debe09f062ce434ccaf64db6f7fa2399a399d6
font_01_sfnt_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 10464 bytes
SHA-256: 2b2710527a2cbd4492870b01a9c3b2f759c2bc4e19b9c717c1a05068b445f150
font_02_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16088 bytes
SHA-256: 62b3948e0e40d8ba1e83d9aa19c7af70085e7b6691727982ba447b75cbddb3f9

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