Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86a51fd869bb03f…

MALICIOUS

PDF

79.2 KB Created: 2021-03-15 06:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d1ae6f766771398c32b5c6f561f0eaa SHA-1: d1409f6ef3358f02f6132fac2aefd9df181cce47 SHA-256: b86a51fd869bb03f055df3a25717065efd2aa31aa63aa19a134363870e09d741
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism. The primary external URI points to a search query for a dryer manual, which is likely a lure to disguise malicious activity. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=kenmore+elite+oasis+dryer+manual
    • https://takixesa.weebly.com/uploads/1/3/4/6/134621412/e4de1.pdf
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/1af775d.pdf
    • https://fefoxotavom.weebly.com/uploads/1/3/5/3/135328849/706459.pdf
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/245edbe0fd.pdf
    • http://betabudon.iblogger.org/google_drive_access_denied.pdf
    • http://xifutuvetowa.iblogger.org/where_to_fix_my_electric_scooter.pdf
    • http://puwuditufu.22web.org/libro_de_probabilidad_y_estadistica_1_telebachillerato.pdf
    • http://jazovez.iblogger.org/does_ashton_drake_offer_free_shipping.pdf
    • http://piwifeg.22web.org/little_house_on_the_prairie_books_age_level.pdf
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/somepewopekonew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://punozelejewi.rf.gd/is_very_good_better_than_excellent.pdf
    • https://s3.amazonaws.com/nemafu/59299426014.pdf
    • https://s3.amazonaws.com/zemunomipazikez/apeman_a77_manuale_italiano.pdf
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_c9dcb1c2c1fe4e4daed8f9c69ea33b3b.pdf?index=true
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_b626b8faac88475486a163aaba3100d2.pdf?index=true
    • http://latowetutut.epizy.com/581522809.pdf
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_63cb1ac4db5244dc961af79fb6d92670.pdf?index=true
    • http://vimevuda.rf.gd/analog_clock_app_for_android_free.pdf
    • http://rixuweba.rf.gd/5722152654.pdf
    • https://s3.amazonaws.com/vabedafozo/nuzefigonar.pdf
    • http://gulavutimomoxu.rf.gd/99299949688.pdf
    • https://s3.amazonaws.com/fasomusogapovi/tobijig.pdf
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_ed148136e0f94f91a253e2d6589dcd8b.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed49.bin
a0dba452c30592425200238022a198b5418ff3d40b9aa70a4695610138ce0d7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 5040 bytes
font_01_sfnt_off0000fe5d.bin
ac2fdb95e95e03401402cdcd7c12c97a9ec559e248bf57657676ae4710927cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 14556 bytes

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