Malicious PDF — malware analysis report

Static analysis result for SHA-256 34db0dd0d38cd055…

MALICIOUS

PDF

59.6 KB Created: 2020-12-25 01:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f9dcc29a04867ee45b15fcaa0117f4c1 SHA-1: 22314318d04490a213786988041f7b822b2e66b5 SHA-256: 34db0dd0d38cd055831dca702a06dcc1bed20668f8047a2303ff4b037f954ea8
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of a 'LOLBin run command' heuristic firing also points towards potential exploitation or execution of malicious commands. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it is designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://traffset.ru/aws?utm_term=information+utility+marketing+definition PDF link annotation
    • https://cdn.sqhk.co/zifakepavax/FjfL5wk/tovuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_5fb98f3f804ce.pdfIn PDF document text
    • https://cdn.sqhk.co/rapavuse/NcjcVig/minecraft_godzilla_mod_1._14_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5fc7e94765f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5f8f8e2ea750b.pdfIn PDF document text
    • https://cdn.sqhk.co/soredepel/hiheUie/15599087170.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/352027.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/hhcmDhf/78526976234.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/ZhaHmgh/credit_freeze_transunion_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/ZhaHmgh/In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukidosifixi/campus_life_at_usc.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/primary_assistant_teacher_exam_question_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/capricorn_man_aquarius_woman_yahoo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/what_does_culture_mean_to_you_interview_question_answer.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_off0000b04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04B 5152 bytes
SHA-256: f2030abd97a015e4292580ff56e00fc21b6433a5b1ad5287f7e8e7a3d1b91046
font_01_sfnt_off0000c1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 9404 bytes
SHA-256: 4865f8deec4bb4464966575d7f84bee3a71328820adac7b9fbe4fa99b80dd28c

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