Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da1d04f7b37287e…

MALICIOUS

PDF

110.0 KB Created: 2021-03-10 02:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1481007120d8ead15c05b5c07cade551 SHA-1: fe275af3f02afe27cd6a227b3a8fa278214b5413 SHA-256: 2da1d04f7b37287ea2b154a6fd4bfc33053f35e8a367cfe9257b4084c30cf4c9
126 Risk Score

Malware Insights

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

The PDF is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to PDF creation and a misleading title, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://druttle.ru/123?utm_term=integral+of+trig+functions+pdf PDF link annotation
    • http://fukuzowi.sportsontheweb.net/how_to_reset_brake_fluid_light_on_bmw_e90.pdfIn PDF document text
    • http://mebel-albero.ru/568399022325u25v.pdfIn PDF document text
    • http://mon-cmbretagne.com/53985697634dbu1i.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/53592936924.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/wawojogab.pdfIn PDF document text
    • http://kixesisero.22web.org/51620277564.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/85940487112.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/java_swing_mysql_connection_example.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/vonetugesifiz.pdfIn PDF document text
    • http://reduslim-officialsite.site/bugebadigofesupajapejubirtoqio.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/janovorapi.pdfIn PDF document text
    • http://nuxirofa.iblogger.org/45499028782.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/zadularesitefojejepok.pdfIn PDF document text
    • 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
    • http://besafetusupug.atwebpages.com/xezujiworifimutudutebate.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_3701dafa1b1d4fba9b23c562cd3996f6.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_fe5026239318498496536dddea8f6bc7.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_b4f3add954b443589d6b0fb113e33148.pdf?index=trueIn PDF document text
    • http://mojigoka.atwebpages.com/sundance_spa_capri_owners_manual.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/game_of_thrones_book_release_date_2019.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_5e1de47f802944e98fa7133420953d59.pdf?index=trueIn PDF document text
    • http://vafowoloxesimam.rf.gd/its_never_easy_to_walk_away_let_her_go_itll_be_alright.pdfIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_2c8cfb0e791e4c91b9d9558733981703.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017007.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17007 24240 bytes
SHA-256: c8c39b69c6f814674af17b35947ebb11041e6e5565643c83b8c8d23f36498c6a
font_00_sfnt_off000136d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 5144 bytes
SHA-256: 686e07a62f87ec2271acfc828e0e753856a6f89ffc60e12296fccf1f9213e8c6
font_01_sfnt_off00014854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14854 11640 bytes
SHA-256: 429344514107dce3861130007b067d292bf79338ab27f004c80219c5dc636b0f
font_03_sfnt_off0001997f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1997F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34