Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3b850d34b97b42…

MALICIOUS

PDF

75.1 KB Created: 2021-02-28 23:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: dec3c484b2b3fbaf8b4a577d59eab3c6 SHA-1: e5f3067262faa2b039ae50287547ecdbf2ce28da SHA-256: cd3b850d34b97b42bd5435321005f6755ec37ca362ea87a1a802bfd6ac836601
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious link as a product manual, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=homedics+vibration+foot+massager+with+heat+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_601b9784e2779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_602d341f6457c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379043/normal_5fe58f35c6dba.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/figUgag/final_fate_td_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/2hhPih8/drive_in_movie_theater_nj_newark.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_603482c8820a5.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/iazjjhf/xakekuxozetofi.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/gek7hRE/free_casino_roulette_no_download.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/novifamigot/personal_reference_letter_for_rental_property_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/46255917924.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/net_speed_monitor_app.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/michelin_guide_vietnam_hanoi.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/vomifafubivozasuju.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/o_que__o_que__piadas_engraadas.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/business_logo_maker_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/html_entity_php_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/beautiful_banner_background_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/61377136718.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/gikiroxetuxozimexabusi.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/diveguwepifumi.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/89054322001.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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5688 bytes
SHA-256: 8bc3d0c8886ceeefb5505be8515340531687a63047f4148ccc3b5a0c6baffad6
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 11072 bytes
SHA-256: ef2ee05510b2a0bf149257f17c2a21481c3ca66a4cdc3d4940778f9dbd8aae8d

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