Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaff70f72d80867f…

MALICIOUS

PDF

97.9 KB Created: 2021-02-24 01:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e9971aa26172c2baba97b281c62bf7f9 SHA-1: 229c5d63aaa9bd384b9c9bdd71c087cdbf490156 SHA-256: aaff70f72d80867f1c58e232c854af027a9f8c32245b561c7a6745eb2fa68d6d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=how+to+reset+a+shark+watch In PDF document text
    • http://degitowexara.iblogger.org/nts_lumhs_answer_key_2016.pdfIn PDF document text
    • http://whitetwo.space/3050970482zols1.pdfIn PDF document text
    • http://reduslim-shop.website/sample_business_proposal_email_formatd3nay.pdfIn PDF document text
    • http://idealicacolumbia.site/acog_guidelines_gestational_hypertensionl1paf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_6021cc6c25e26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5ff7894034b3b.pdfIn PDF document text
    • http://topsale.pro/pictionary_words4u5hb.pdfIn PDF document text
    • http://mnogoturov.com/business_games_iosfs7lx.pdfIn PDF document text
    • http://wezejej.22web.org/cinta_bertepuk_sebelah_tangan_dewa_19.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/16263374799ybnl7.pdfIn PDF document text
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/5468613.pdfIn PDF document text
    • http://xawapose.22web.org/bestwap._in_movie_2018_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_602d3eecd0e50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5fc628ccf0bdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365639/normal_60021d6ee4473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_6026a18005deb.pdfIn PDF document text
    • https://nasuxixogidipan.weebly.com/uploads/1/3/4/7/134701521/9282869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://polebofoxajiras.rf.gd/51308298938.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_off00013651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 4972 bytes
SHA-256: 5cabb01478e541acc5b193553a875466060391ef27cfc669def278b8dc8a8f7a
font_01_sfnt_off00014742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14742 17400 bytes
SHA-256: d91583e25f23c1a98f5fb2d889b5c31b005ffa3ac37c15ea20c7b6437824c446

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