Malicious PDF — malware analysis report

Static analysis result for SHA-256 91df0bcc6f302566…

MALICIOUS

PDF

76.7 KB Created: 2021-02-23 09:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: af7c3ad070f19e4786c842169581d6f4 SHA-1: e19fc0ff5b630dcf3d6dc3514ec258860b9334c3 SHA-256: 91df0bcc6f3025669e49bd321d6f526e053b12f808ea70c05f013691bb22e9de
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=stages+of+prenatal+development+worksheet'. This link is flagged as a known malicious redirector, indicating the document's primary purpose is to lure users to a potentially harmful site. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URL is sufficient evidence of 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/wix?keyword=stages+of+prenatal+development+worksheet In PDF document text
    • http://mexuloxuxinona.iblogger.org/software_tester_job_responsibilities.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/ggjhRRB/66192495935.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/iSjgUhj/17937150708.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/4iigi7a/pokemon_go_friends_xp_lucky_egg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503524/normal_6019f8141957e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413969/normal_60002e8b397dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/bluetooth_for_windows_8._1_dell.pdfIn PDF document text
    • http://buzekarutazobe.rf.gd/annual_physical_exam_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/canada_afib_guidelines.pdfIn PDF document text
    • http://gumuwojurigab.epizy.com/beyblade_burst_apk_and_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/anand_full_movie_mkv.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/gfycat_not_working_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/biochemistry_eighth_edition_berg_tymoczko__stryer_w._h._freeman__co.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/48006764768.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_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 5772 bytes
SHA-256: 37d21232585d9f96e63ef7222f0fba0792c24bf4c6bd03d910be42c2f085aa45
font_01_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 10484 bytes
SHA-256: 402d9dc8fd328b7db326915309a117f11a29f90c07edb1db5d2b2642180cfd3a

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