Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d90b99c43586320…

MALICIOUS

PDF

74.6 KB Created: 2021-01-25 11:55:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dd3c710fb4aaf8964d6b3dd3682acf01 SHA-1: e533c7fe0e5bcfc040eac18b4d689a1d481b9dcf SHA-256: 3d90b99c4358632039f601abcc1568a5db6f0a0b0819de72c1e0dd2aa89e69b6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. The document body, though heavily obfuscated, suggests a lure related to biological information, likely to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=animal+cell+centriole PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458125/normal_5fe1660d83ec0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462976/normal_5fd056338f0a8.pdfIn PDF document text
    • https://bikepudebap.weebly.com/uploads/1/3/1/4/131405977/e8215dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_5fe814b572eaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_5fd795229f2dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379736/normal_5fff5025afae2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5ff956553a695.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/b520ea766aa.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/2232073094a.pdfIn PDF document text
    • https://nuzaxegef.weebly.com/uploads/1/3/4/8/134857273/1de005318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubolorira.epizy.com/xobawufejazinekajan.pdfIn PDF document text
    • http://bavubuseji.epizy.com/54391570619.pdfIn PDF document text
    • http://pavunununege.epizy.com/astonishia_story_psp.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/java_swing_gui_tutorial_netbeans.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/calvary_temple_telugu_messages.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/eclipse_oxygen_jee_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/33020774187.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/canoscan_9000f_mark_ii_software.pdfIn PDF document text
    • http://rubujizuz.epizy.com/9245378971.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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 4756 bytes
SHA-256: 8dbfac5785ebe853dedb06f1c7bbb629bba3987cbaca81336a164b6a36e12490
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 11360 bytes
SHA-256: 0c22fc2ca7827e87169349e78a9499d240fc375d6991ed132315560fe653026b

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