Malicious PDF — malware analysis report

Static analysis result for SHA-256 a021c11be7d8e455…

MALICIOUS

PDF

69.0 KB Created: 2021-02-22 14:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1d3e6fbb4618b0c78771a8b9cf3c9556 SHA-1: 6d8617abdab6e08b933c09361f65d96d7acb361e SHA-256: a021c11be7d8e455a57407a9beebc342d25fe0770df4ad7d7a1ff1df57b7d1ec
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, including a critical finding of a redirector link to 'yafferge.ru', suggesting an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to 'Where's Waldo' and download prompts, reinforcing the lure. No scripts were extracted, but the presence of numerous embedded URLs and the critical redirector link strongly suggest an attack pattern focused on directing users to compromised or malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=where%2527s+waldo+online+game+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_5fd1ac87baf32.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/da18Lie/tribal_mania_miami.pdfIn PDF document text
    • https://cdn.sqhk.co/titubebojek/sGQgc4P/sos_stands_for_emergency.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366630/normal_6007234325665.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/V6HUxhV/89106039993.pdfIn PDF document text
    • https://maverutorolo.weebly.com/uploads/1/3/5/3/135393183/ferumilewigiw_naxibazufabed.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/Lvafbig/glitch_camera_app.pdfIn PDF document text
    • https://ritefebeg.weebly.com/uploads/1/3/5/3/135316582/51c9c9ac5.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/nupukojulase-biwunabuli-zezetabezuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_6014692b297fc.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/rHaRDjf/picture_wall_collage_ideas_frames.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/A47asji/67912908319.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/EiijYig/48622521086.pdfIn PDF document text
    • https://cdn.sqhk.co/mamozinuba/bifih1S/download_asphalt_nitro_for_pc_windows_8.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/wixanarer/agric_loan_form.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/viber_for_iphone_4s_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/behavior_modification_10th_edition.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_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 5460 bytes
SHA-256: 55b2c1f00a38627f6ab0e085acb2cec27564fb1060e09a226dcf322801e0b084
font_01_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 9668 bytes
SHA-256: fb8ad663911383991d43bd1abbf7ed3a2e3aaa011ea6172df0b9d714ec205bed

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