Malicious PDF — malware analysis report

Static analysis result for SHA-256 7469fdaccf956903…

MALICIOUS

PDF

72.0 KB Created: 2021-02-24 15:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b7a008f103c367df6e9f7d32c0db440f SHA-1: 2b043bc6c5e879ef125e245695f9a31a247beb86 SHA-256: 7469fdaccf9569035377fb22dc56511e3cee4daa579dc5e23cf024997ed8a291
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it uses an SEO redirector for phishing. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The embedded URLs point to potentially malicious domains, indicating a likely phishing or malware distribution attempt.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wix?keyword=find+the+derivative+worksheet PDF link annotation
    • http://hotel-engels.ru/trigonometry_law_of_sines_and_cosines_review_worksheet_answerss89bn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486563/normal_5fdf958cbf701.pdfIn PDF document text
    • http://cmbmarketing.agency/what_is_chemotherapy_for_cancer_in_hindiyawnt.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/hcpjihe/manofiz.pdfIn PDF document text
    • http://magazinrf.xyz/bhagwa_rang_song_dj_mp4qoojd.pdfIn PDF document text
    • http://13millions-warzone.store/nikewiruximulukov04t4.pdfIn PDF document text
    • http://proita.fun/left_handed_bass_guitar_scaleskabns.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/lovibarexonejisexao8rso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5ff7850fb872a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494648/normal_5fc5b48f85580.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/jiigja1/cowboy_good_morning_pic_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/iiavieM/ringtones_for_android_2020.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/representation_stuart_hall_summarywv778.pdfIn PDF document text
    • http://naturebiolog.space/interior_design_styles649m4.pdfIn PDF document text
    • http://limons.space/what_factors_can_influence_your_perceptionrvjhu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470405/normal_60087a4786a36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381766/normal_5ff03b4daf65f.pdfIn PDF document text
    • http://helpverifybadges.com/9742474499jy2ry.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 5052 bytes
SHA-256: 12400297bed2551f8d8a06727d1806c7ace0da1ae0389d16cac5875449575dd1
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 10276 bytes
SHA-256: fc78b686a880f5ab8372ef475772e48fe57a45cc03eefe822695ac561ee0c013

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