Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b17a3c2069a7f26…

MALICIOUS

PDF

74.5 KB Created: 2021-04-03 22:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77efe6e1065406ea8355226a0345daf5 SHA-1: 94ad4c5fbc1ef928ae4ea4cd2a17e752adb6e46e SHA-256: 4b17a3c2069a7f26f4af59f60740d6cee25146ee66e557e1ee19ba407bac9de3
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'druttle.ru' which is suspicious and likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the idea that the PDF is a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=azure+cloud+services+pdf
    • https://cdn.sqhk.co/kuzosexiwugu/54Hjbgg/jiffy_lube_chicago_ridge_il.pdf
    • http://1offpark.xyz/sukojuxusomuwc198.pdf
    • http://osmosiotzs.fun/what_is_the_biological_psychologyb5o4g.pdf
    • http://ligoturup.22web.org/livolawafobewatat.pdf
    • https://cdn.sqhk.co/wuvidomanale/ibiaCGB/44876284404.pdf
    • http://podemufibe.iblogger.org/17735004992.pdf
    • http://zebrait.fun/fundamentos_de_la_redaccionx5b0r.pdf
    • http://duplicwcnj.space/96427705437dufyk.pdf
    • https://cdn.sqhk.co/poraloguve/fijcyAM/telalelototo.pdf
    • http://twitter-center.com/sling_training_full_body_suspension_workoutqfkzz.pdf
    • https://cdn.sqhk.co/gebitasixa/ggjaESG/flying_dragon_simulator_spacex.pdf
    • http://lnstagram-helping.live/avent_steriliser_cleaning_instructionsc3qty.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gawekavadave.epizy.com/telugu_audio_songs_free_2019.pdf
    • http://vemesivudaro.epizy.com/mental_health_assessment_form.pdf
    • http://vevisadoko.epizy.com/osrs_fletching_guide_f2p.pdf
    • http://juwikiz.epizy.com/kitavuduxodidinekuviko.pdf
    • http://bigerubuseke.rf.gd/62008717161.pdf
    • http://rufukapujame.epizy.com/ar101_oral_immunotherapy_for_peanut_allergy.pdf
    • http://kotopofixivu.rf.gd/mamumunadofoziralo.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e686.bin
fe172a896d2d4822ca703facf728b5fb932d64153582aa4561abca3e39add8ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 5036 bytes
font_01_sfnt_off0000f7cc.bin
503f606915e1b41f21cca24ee1f8c07aa8f3ff3a5792d684b23c787e2dae9647		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 10904 bytes

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