Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe2004882b25273…

MALICIOUS

PDF

85.4 KB Created: 2021-03-06 03:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 92fc94cbce4d658c3b45b0ab27dbe186 SHA-1: 43322f7126bddb62e3c007a7ef09f465ea38ef6d SHA-256: 8fe2004882b25273fc0200d3274af6746333afe35d7b7f3ca8f36d0534c6fb0c
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. An external URI, https://golowaki.ru/wix?keyword=constraint+vs+restraint+engineering, was found embedded within the document, suggesting a phishing or redirection attempt. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/wix?keyword=constraint+vs+restraint+engineering PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502567/normal_5fcce4875c1d3.pdfIn PDF document text
    • http://top-agent.ru/hotel_business_proposal_samplevndft.pdfIn PDF document text
    • https://vavinaxedekofew.weebly.com/uploads/1/3/0/9/130969509/pifuni_jutobusazuzik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_60242209ad198.pdfIn PDF document text
    • https://fataleripe.weebly.com/uploads/1/3/0/9/130969718/juxebabobololerise.pdfIn PDF document text
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/variwujovi.pdfIn PDF document text
    • http://idealicacolumbia.site/magnus_chase_the_sword_of_summer_full_bookrv7i6.pdfIn PDF document text
    • http://starconflict-game.ru/73992146908y5vm4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5ff40d2c37d32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5fcd7885d7499.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/7e37d0a015e7.pdfIn PDF document text
    • https://zufojemesegogof.weebly.com/uploads/1/3/4/7/134753559/1029037.pdfIn PDF document text
    • http://usblighter24.site/tuzutizuzewivivojidb0dj4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekorizaji.epizy.com/razomob.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/41723853845.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_00e3ffad6b054da48ec8b4093e82fbbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/calendar_method_of_contraception.pdfIn PDF document text
    • http://tosodesuvivat.epizy.com/34460979700.pdfIn PDF document text
    • http://lijulipewagikev.rf.gd/trex_500_esp_battery.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_db7f375aa3344fa4aedfbb5c7565f679.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wofaxil/85207644335.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/photo_brightness_app.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/aviva_plc_annual_report_2015.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_b5cbc4eaf09443d4a139b56a41248a44.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 4788 bytes
SHA-256: 424ad08b687f2038d8399d6e405125bbfd34d9c5a95333ec119f398b142276b3
font_01_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 10804 bytes
SHA-256: aa62261d33c0bea3b247bd8896019f84bf9e4058a8b9afbff8f1be2c80f442b5
font_02_sfnt_off0001322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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