Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2ee90e511f25b8…

MALICIOUS

PDF

87.5 KB Created: 2021-02-20 19:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3654d696322b2daac3c02d36f55dd5a9 SHA-1: 3e14c960b118ae8eab55f039880cf7d4dd53a09e SHA-256: 9a2ee90e511f25b8d565e5bc793a13eea5ace7ab2518ded1e39c234f461eea35
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=children%2527s+islamic+story+books+online`. This suggests the document is designed to lure users to a malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the PDF and the embedded malicious link point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=children%2527s+islamic+story+books+online In PDF document text
    • http://sewutaf.iblogger.org/how_to_start_a_soccer_training_business.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488133/normal_6004716dcb788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446272/normal_5feeb3c82697c.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/UZxzrUw/94374535710.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/eieidhi/sports_mole_live_football_scores.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/gNdhhhv/battlehand_legendary_cards.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/XEicgjy/nonagisotasutivijuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5fe2b5731203a.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/giaiiAd/4779771345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefeluxezilire.epizy.com/42947386597.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/10505575549.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/renuxaregej.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/tujinumor.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/53209078429.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/celkon_a35k_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/kaxevenomuriviminogapef.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/real_estate_due_diligence_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/89934292959.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_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 5424 bytes
SHA-256: fa418d860a56a2b9ef5de01202eb318d5ea52c0e99d932b92d40a2202af9e091
font_01_sfnt_off00012ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 10960 bytes
SHA-256: a4f622223e8e4cffd86bbc9835017b7aa500e4d076c7d5641194c4f742376b98

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