Malicious PDF — malware analysis report

Static analysis result for SHA-256 539ca03cd6bf623b…

MALICIOUS

PDF

73.7 KB Created: 2021-02-13 16:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3e4f10eb33aadcfd6dbf334ed6dd61a0 SHA-1: df0d5582acc3eea88b6bdbcd3e98c5f36338a191 SHA-256: 539ca03cd6bf623b8a1e2a049e60da2b22edaea3d742e9296484793b9b323958
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=teutopolis+unit+50+board+meeting'. This indicates the document's primary purpose is to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=teutopolis+unit+50+board+meeting In PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/9668169.pdfIn PDF document text
    • http://milanbeach.fun/starter_checklist_in_word_formatyiiub.pdfIn PDF document text
    • http://nesobaka3.xyz/845477067244xe0t.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/0d53e8d.pdfIn PDF document text
    • http://hayatevesigar.online/9468287113962jao.pdfIn PDF document text
    • http://portkamesto.site/keith_laumer_bolo_download7gcjk.pdfIn PDF document text
    • http://damvglaz1.xyz/leetcode_pythonpp9u2.pdfIn PDF document text
    • http://lassituda.online/child_of_light_ps3_trophy_guide1lb1p.pdfIn PDF document text
    • http://ellmax-site.xyz/940742939408n9ep.pdfIn PDF document text
    • http://batut.space/charles_aznavour_formidable_deutschqihtm.pdfIn PDF document text
    • http://bokugezus.66ghz.com/free_sample_payment_agreement_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vigevot/38592073361.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/64866750873.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/bhagavathi_tamil_movie_audio_songs.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/litev.pdfIn PDF document text
    • http://fabowifomewod.epizy.com/aankhen_1993_full_movie_free_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/rijatoni.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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 5516 bytes
SHA-256: 3201587a800a3e7ce4f50ed09166dcd9c08b85ee3c45748f43334c1ff0a236bb
font_01_sfnt_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 10824 bytes
SHA-256: 722e7d7b5f2383c801d073ae5418800d38c959b08821f068313f063e0bdf59c3
font_02_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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