Malicious PDF — malware analysis report

Static analysis result for SHA-256 82161baf807e19ed…

MALICIOUS

PDF

84.6 KB Created: 2021-02-11 22:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4b9817ebce289b88c22deefd7f641d6 SHA-1: b676e628e3006b6248e639a2e3848b914a80cd9c SHA-256: 82161baf807e19ed8e800a894c8ddd8267b24a2e017f00891b2cf41c3192e3b8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that likely serves as a lure, disguised as a Mercedes Benz repair manual. The presence of external URI heuristics and the ML/ClamAV detections strongly suggest an exploit is being used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=mercedes+benz+w124+repair+manual+pdf
    • https://static.s123-cdn-static.com/uploads/4482228/normal_5ff2bbe7bd63e.pdf
    • https://static.s123-cdn-static.com/uploads/4449004/normal_6007dc525cc42.pdf
    • https://cdn-cms.f-static.net/uploads/4419412/normal_6022ec1a3de29.pdf
    • https://cdn.sqhk.co/mijajijem/PjhigUR/7101842549.pdf
    • https://cdn.sqhk.co/pegebatanuz/jdgi90D/22481853081.pdf
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5ff38b053aee0.pdf
    • https://cdn.sqhk.co/kitujesijak/KiKgQgj/vibonafove.pdf
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5ffdd33639425.pdf
    • https://cdn.sqhk.co/jeforije/zheW6ge/egg_noodles_vs_pasta.pdf
    • https://cdn-cms.f-static.net/uploads/4485696/normal_601638f032875.pdf
    • http://zumigiguba.22web.org/solving_exponential_equations_and_inequalities_worksheet.pdf
    • http://my-favshopf.online/winry_rockbell_rule_34w52i6.pdf
    • https://cdn.sqhk.co/gexedamej/wdjfDd3/funny_video_download_whatsapp_status_2020_tik_tok.pdf
    • https://cdn.sqhk.co/mifopanikil/iijugjV/lorogamofirasikalome.pdf
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5feb01bae1ba1.pdf
    • https://cdn.sqhk.co/nasanoroge/2gdMaAY/jewexefexatozigufakowevi.pdf
    • http://abzac.me/8598388791791ec6.pdf
    • https://cdn.sqhk.co/pilimisoduk/cBjDxjc/shane_warne_spin_bowling_masterclass.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rikukevez.rf.gd/clean_architecture_a_craftsman_s_guide.pdf
    • http://nabotiwufonego.epizy.com/review_sheet_mask_innisfree_coconut.pdf
    • http://badokelo.rf.gd/the_countdown_clock.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff53.bin
ad2f1f5ee40bf86a6c76ba3f5dfc7ec387b1bf226c1b9747a06e747cdd78206f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 5552 bytes
font_01_sfnt_off00011235.bin
d9a1e4d72965420ee6a43f9d47fd6d6b12785dac35fbab77888d1f0918c7466c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 10596 bytes
font_02_sfnt_off00013670.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 4324 bytes

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