Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ffe61a01e62b84…

MALICIOUS

PDF

68.9 KB Created: 2021-02-11 20:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e0eb714ead68251aa53264b3d1d9de78 SHA-1: 4eef0466b45476fac38d7292d4732890240f3227 SHA-256: a4ffe61a01e62b84b6ec92de4a6bb5e19bf1e20ec68d1c2c98c8a2315dce6b26
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It contains a mass external PDF link farm and a redirector link to 'https://yafferge.ru/wix?keyword=nba+live+16+android+apk', suggesting an attempt to lead users to malicious content. The presence of a 'download button' lure and instructions for a password-protected archive further support a phishing attack pattern designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=nba+live+16+android+apk In PDF document text
    • https://nevomunetis.weebly.com/uploads/1/3/0/7/130740414/sumojezigese.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/15d97fbb8176bfa.pdfIn PDF document text
    • http://itverys.space/at_t_enhanced_push_to_talk_appo5m92.pdfIn PDF document text
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/zobofulolotupir-nalifevuzefa-xoguveregu.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/nagitefikerij-vuvapil.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/fonam-detowip.pdfIn PDF document text
    • http://albatros-trans.ru/70786184029l0jhq.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/8e716ba.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/vesubodufisi/fosiwadukepibisubi.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/51646394931.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/synonyms_worksheet_for_year_2.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/toward_an_anthropological_theory_of_value.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/brevini_gearbox_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/are_eucalyptus_sheets_cooler.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/endless_summer_book_2_chapter_13_answers.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_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 5216 bytes
SHA-256: 38ce4cc21f21546f00ed1402d553184b2a83aa4a7d1612596aacf2285c9ea7bb
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10800 bytes
SHA-256: 61f013250dd754e9915a6c3c3eed460daa72a2b8eb897d25b8a2bd9aec6e1204

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