Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a640712ef334542…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 14:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28876db0209688c8f5be35f0e57d1314 SHA-1: 7fbea0da634e8986c675754b5fa1b6af4c08d7df SHA-256: 7a640712ef334542ee76d6634ddd50ca0ad7edbf14f50aa76cbb23a2e5432e28
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Civil engineering manual book' and the authoring application 'wkhtmltopdf', suggesting a lure. An external URI, https://pelibifir.ru/wix?keyword=civil+engineering+manual+book, was extracted, indicating a likely redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/wix?keyword=civil+engineering+manual+book
    • http://comp-arenda.site/mawemekajerufamlomxq.pdf
    • http://meine-gebuhrenfrei.com/aggiornamento_android_xiaomi_redmi_4ku9uz.pdf
    • http://construt.site/begowelejowldwk3.pdf
    • http://presente-top.store/beijing_international_airport_arrivals_informationtapqr.pdf
    • http://bossyonlinex.com/facebook_marketplace_cars_st_louisnbpeh.pdf
    • http://gebuhrenfrei-mein.com/tulowal0i1ck.pdf
    • http://shtangelkipokupkiitd.online/wiluxudenetuzixofofadaxt26sd.pdf
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5fc71bcb0ac52.pdf
    • http://honey-love.ru/tegogejoxoguwelagijolay9wvh.pdf
    • https://cdn-cms.f-static.net/uploads/4467322/normal_604a2c970e0d1.pdf
    • https://static.s123-cdn-static.com/uploads/4501029/normal_5ff6014b5f867.pdf
    • http://cloudplay.xyz/kibevosigatonojovomemakik51kio.pdf
    • http://airbin.top/buluxuzuk3n61c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nuxepiduded/67146484238.pdf
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_dec69859abd04e1e9cd3c47ea7c0e0ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7fe7981a-539e-4bd6-9206-169fb34ff722/8549015005.pdf
    • https://s3.amazonaws.com/pirofopafu/nefimikosokaweziboxafe.pdf
    • https://uploads.strikinglycdn.com/files/0360c7cb-5349-433b-91e8-18d0b3e3e141/cursos_de_ingles_basico_online_gratuitos.pdf
    • https://s3.amazonaws.com/povodijirig/format_bitlocker_usb_drive_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/d67af28f-68be-4f4a-928c-af5fa6437ef6/why_do_i_get_water_bumps_in_my_mouth.pdf
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_f158d08c770c4cf3a4a0992118e0ea58.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb6a51c9-0cd6-45a7-b0d8-91d0c81e1ed3/why_is_my_tablet_charging_so_slowly.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_off0000f0af.bin
a1c0f2a16196367369ef26876f4d15e5c94a3a657b02cee0322f3b5c9e87d67f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 4916 bytes
font_01_sfnt_off00010146.bin
ff78a4920c74cf4947ab90cdf3d393d459febb56873bd3072336051ce66ecef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 9724 bytes
font_02_sfnt_off00012280.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 4324 bytes

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