Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8af4b07f562b0f8…

MALICIOUS

PDF

81.8 KB Created: 2021-02-10 04:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b895d8efde4d52b9e1198957aeab933c SHA-1: ada95d6b2f633574ee5b2709b1ea7fe3bb0a755c SHA-256: a8af4b07f562b0f8b1ac09c98de1bd5f7805b9800950aea8af30b1f574b5fb4b
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=high+school+chemistry+final+exam'. The document body, though heavily obfuscated, contains text related to a 'high school chemistry final exam', suggesting a lure. The ClamAV detection and ML classifier further confirm its malicious nature, identifying it as a phishing trojan.

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=high+school+chemistry+final+exam In PDF document text
    • http://nufurimuler.iblogger.org/ign_fire_emblem_three_houses_wiki_guide.pdfIn PDF document text
    • http://fuzuxozexuvir.22web.org/adverse_reactions_metformin_hydrochloride.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_601b08ad37d86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_6006ea9513296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505363/normal_602103f72daac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_5fdb586856d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_601d76fa94894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489407/normal_5ff91bf06d44e.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/kufazete/26505364556.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/90755365125.pdfIn PDF document text
    • http://dopuviboxew.rf.gd/44420464852.pdfIn PDF document text
    • http://birofasadonu.epizy.com/best_electronic_simulator_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/jasaledewewumevejifajo.pdfIn PDF document text
    • http://sexepafo.epizy.com/ultimate_bandsaw_box_book.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/best_news_aggregator_app_android.pdfIn PDF document text
    • http://gitogopafo.epizy.com/gokuzokazoxuponobutov.pdfIn PDF document text
    • http://gugogedufos.epizy.com/kuvuwevo.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/bootable_usb_maker_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/53351982465.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_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 5424 bytes
SHA-256: b14be3c63ac928ec6e68a64070ca50793e6f2f21c23e2375407cf3aebf4e14f6
font_01_sfnt_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 11104 bytes
SHA-256: ebf30e116d577d0a8d199f9f6a365600e800ee5427210a236dd8a7b7f578c4c5

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