Malicious PDF — malware analysis report

Static analysis result for SHA-256 661ed144d81b8d22…

MALICIOUS

PDF

77.6 KB Created: 2021-02-27 17:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 09e6c3f4d408b40c810247e682d5aacc SHA-1: 80e87ad7718736129fd4f4e6e40365bd9579b3a9 SHA-256: 661ed144d81b8d229c9a2018f9d8ef6c2627915fec70a8ca7bbc9a9a0a5b7a57
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a redirector link to a known malicious URL. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather to facilitate the redirection. The presence of numerous links to disposable hosting and potentially malicious domains indicates a phishing or malware distribution attempt.

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://crophysi.ru/123?utm_term=chef%2527s+choice+knife+sharpener+436-3+instructions In PDF document text
    • https://cdn.sqhk.co/zowonefaso/d8BBgek/44185942774.pdfIn PDF document text
    • https://cdn.sqhk.co/nadoranur/hgiagfP/97220359261.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/4afr1hg/renovezutovamukolib.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/nhbggh4/10752636709.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/tojufuwivawosewilufogokod.pdfIn PDF document text
    • https://cdn.sqhk.co/dirodivive/ghjbgeN/sisters_movie_soundtrack.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/32874133854.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/94060041620.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/2017_ktm_duke_390_owners_manual.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/mewaret.pdfIn PDF document text
    • http://katipef.medianewsonline.com/84409952116.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/wolina/cell_membrane_transport_lab_report_discussion.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/aspiracion_de_secreciones_2017.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/23250009256.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/barclays_gender_pay_gap_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/xupemara.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/food_stamp_assistance_income_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/80648709690.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/24169438950.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_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 5512 bytes
SHA-256: 8621be9faea86be00525d9d83f0e81ca38a3fe26839cffe55331f7d6bb2f7665
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10544 bytes
SHA-256: 7809b154532ba6bb380f360c0702eb685916ccca66734b410e43b1e950e64ea8

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