Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7dc6dfc4498107…

MALICIOUS

PDF

67.1 KB Created: 2021-01-17 05:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22990c21a2cdbeace22ba791884e58f6 SHA-1: e30ac86f090652d937851ac4b960a73169c23139 SHA-256: cd7dc6dfc4498107ec46a43b3f54559ebd575a286280438f7c6adcf932351684
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Defender marine sale date' and authoring application details, suggesting a lure or decoy.

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://traffking.ru/wb?keyword=defender%20marine%20sale%20date In PDF document text
    • https://site-1168191.mozfiles.com/files/1168191/thiwanka_dilshan_hiru_star_song.pdfIn PDF document text
    • https://site-1172508.mozfiles.com/files/1172508/free_css_education_website_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/gixieQy/seesaw_logo_transparent.pdfIn PDF document text
    • https://site-1173933.mozfiles.com/files/1173933/balloon_dog_costume.pdfIn PDF document text
    • https://site-1207146.mozfiles.com/files/1207146/mathematical_physics_by_hk_dass.pdfIn PDF document text
    • https://site-1167951.mozfiles.com/files/1167951/nova_launcher_pro_apk_download.pdfIn PDF document text
    • https://site-1217437.mozfiles.com/files/1217437/varawizetotuzoxuwudo.pdfIn PDF document text
    • https://lirejodeju.weebly.com/uploads/1/3/4/6/134628820/firofeduzotodoj.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/iaiaid1/95323802683.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/gitipelut/allotment_association_template_constitution.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/faa_aircraft_registration_form_instructions.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_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 5052 bytes
SHA-256: 5e0bac010346db00d4e6d630bd5b23cc71bb298f586b3117019d5557ba96e115
font_01_sfnt_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10676 bytes
SHA-256: f82d0a467724a8fa007b0af89fc969d541a8bb06fb3f740288bbb11e5a76140f

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