Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ef5b826f16ff0c…

MALICIOUS

PDF

81.2 KB Created: 2021-04-05 10:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60575c3d9fd4d5d3b26d160da22fe8be SHA-1: b4c3559bbfa1ad89513fe80083b42a6791540752 SHA-256: 32ef5b826f16ff0cde426b65b9a0a2c6b86673c06b17fe5877092347f2b39a74
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for joining a Zoom meeting, which redirects to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/aws?utm_term=how+do+i+join+an+aa+meeting+on+zoom
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5fe4680da51d6.pdf
    • https://cdn-cms.f-static.net/uploads/4445745/normal_601972bc3ab39.pdf
    • https://cdn.sqhk.co/xawobovuji/ghjjhjr/59818318332.pdf
    • https://cdn-cms.f-static.net/uploads/4389604/normal_60645b9e19b87.pdf
    • http://detijiwajak.22web.org/amazon_book_publishing.pdf
    • http://nuxefigemotak.22web.org/bidokigejuwusajojite.pdf
    • https://cdn.sqhk.co/lewulula/ijcrvjj/quran_urdu_translation_audio_app.pdf
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6065ea5e38ef6.pdf
    • https://cdn-cms.f-static.net/uploads/4450501/normal_600b5d2565bbd.pdf
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5fdd86d5797c1.pdf
    • https://cdn-cms.f-static.net/uploads/4495269/normal_6020ca29cf957.pdf
    • http://wivejudotimog.22web.org/21832345660.pdf
    • https://cdn-cms.f-static.net/uploads/4470038/normal_600a4d1aab143.pdf
    • https://cdn-cms.f-static.net/uploads/4407331/normal_604e08a9d8ae5.pdf
    • https://cdn-cms.f-static.net/uploads/4426257/normal_6009ed2a82e47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/128fac12-cd34-4acc-b0b9-6a2c3fd85692/the_adventures_of_sherlock_holmes_tv_series_sinhala_sub.pdf
    • https://uploads.strikinglycdn.com/files/593e4bcc-6ac2-4106-ae45-91d5499f308e/why_arent_my_radiators_turning_on.pdf
    • https://uploads.strikinglycdn.com/files/64eb8e52-a6bb-405b-823c-07c7ed4ae76f/how_to_fix_hp_envy_4500_printer_offline.pdf
    • https://uploads.strikinglycdn.com/files/81c14e6e-7112-4fd6-8ddb-bb5b340ba50b/things_to_eat_for_healthy_life.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001008f.bin
77acc8049c0db457de760e8840f17cdf2d00399a92c1caffb911e2d931755b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 5016 bytes
font_01_sfnt_off000111ac.bin
f9128f142f9537694d72f1d907e33955ed9da8211e6f3d953a6c4cda64444a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 10964 bytes

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