Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dba9cb224a99a4…

MALICIOUS

PDF

82.5 KB Created: 2021-03-13 21:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 09c0b93af11c5df3d9d00896425dddd5 SHA-1: 1acb720c1d208c23ead395f5b4825b7ec8653d53 SHA-256: c5dba9cb224a99a4314cc7ca39e582b742adecf8fe360e4bd7b77109fd54783f
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by heuristics as potentially malicious and flagged by ML classifiers and ClamAV. The document body, though truncated and partially unreadable, contains text that appears to be a lure related to 'content validity in research'. The presence of external URIs and the overall detection by multiple security tools strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=content+validity+in+research+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465559/normal_5fd5f3ade8dd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fc6cc6a3605e.pdfIn PDF document text
    • http://richmaya.site/mevudufwtfk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5feb2e137cbc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382192/normal_5ffe96e8f18be.pdfIn PDF document text
    • http://kinoogf.space/2485241876865ivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_6029a57622782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_602244c722781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fcb539687e14.pdfIn PDF document text
    • http://xbet1.fun/demedoxudefafosizemy22sw.pdfIn PDF document text
    • http://bonmarket.site/gears_of_war_4_crackwatchoaxtu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_60148eeb50d5d.pdfIn PDF document text
    • http://p-kavkaza.ru/868227412599fhhb.pdfIn PDF document text
    • http://yognat.space/kreisler_love_s_sorrow_violin_sheet_musicmjey0.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/aaba98.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/d4c551.pdfIn PDF document text
    • http://true-board1.club/java_8_language_featuresle415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_604923eaa96f4.pdfIn PDF document text
    • https://kitafawavan.weebly.com/uploads/1/3/4/7/134702073/lineviz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/mata_ke_bhajan_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/directv_now_guide_page_down.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/aadukalam_mp4_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/moon_river_pizza_fernandina.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 5312 bytes
SHA-256: e3b953f4350b53685b2bac57402504e2ce7743e3cd1c00e605a23b93e38edca7
font_01_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 11968 bytes
SHA-256: d5354c7d5e7ecd2fc9fbf9d153f62a3e99a97413dcc63b0a664d343366bec4ab

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