Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedcf8534be1e562…

MALICIOUS

PDF

82.0 KB Created: 2021-01-12 12:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 84be5664c71a63073af1464452c24e97 SHA-1: c4e4aa8bc7e08e401c91b95bdd219b725d34c883 SHA-256: cedcf8534be1e5628a2689cb31936f9f0afaa3fe5227eb9fb87486e5aec046e2
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL and the ClamAV detection suggest the document's primary purpose is to redirect users to a harmful site, likely for phishing or to download further malware. The document body contains garbled text and metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/aws?utm_term=biharmasti+in+3gp+video+song In PDF document text
    • https://site-1168192.mozfiles.com/files/1168192/wire_calculator_voltage_drop.pdfIn PDF document text
    • https://kapekutom.weebly.com/uploads/1/3/4/4/134437999/gizozit.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/3981665.pdfIn PDF document text
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/3b8d1be54c31567.pdfIn PDF document text
    • https://lewutiresapilo.weebly.com/uploads/1/3/4/5/134594640/6364538.pdfIn PDF document text
    • https://tototatinup.weebly.com/uploads/1/3/4/3/134332383/482ae20d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379491/normal_5fde71d81cf84.pdfIn PDF document text
    • https://sasikeruxet.weebly.com/uploads/1/3/4/8/134851076/63b9bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5fb4c217476ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/gevojojo.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/nokia_beep_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/monster_legends_breeding_guide_firetaur.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/hubspot_content_marketing_exam_answers_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/ateneo_application_form_for_college.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/86282558897.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/zavososiwudegasakin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 5616 bytes
SHA-256: 2c02e140753a3d0f55e13b0ab4fd05e8bacb6041eca9086afa95a253f093536e
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10856 bytes
SHA-256: 90e63e67db7c5969e761688edbb556d5d8a84cf148c097db1f44482a0500929a
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 2888 bytes
SHA-256: 6bd7e3c3dc718ac3805d4e5e8e016297a5226226edda2f2b7dc6c1e575dff40c

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