Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5f7d78b7548487…

MALICIOUS

PDF

69.1 KB Created: 2021-01-08 08:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 06d3526e8976b2a2e08a5e8b04a37f67 SHA-1: b4b577f97d2c8d9954ce048197aa61402801f6ec SHA-256: 3d5f7d78b7548487f853a37e68fca98806394ca9afc356ed829528c5140e46d9
202 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting an attempt to lure users into downloading malicious content. The heuristic firings indicate this is a phishing attempt, potentially distributing malware. No scripts were extracted from this sample, but the presence of a malicious URL is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffine.ru/aws?utm_term=offline+dictionary+for+android+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_5f9ac81081c7d.pdfIn PDF document text
    • https://cdn.sqhk.co/kukojuvata/YsJnI0x/tiny_land_wooden_train_set.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/gurowozenupifi/rewards_and_recognition_powerpoint_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/project_discovery_phase_template.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/xezene.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/tutorial_of_java.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/goof_off_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/68246107228.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/hot_wheels_stunt_track_driver_2_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d6af16-f766-4b71-843c-1c50a8d2640b/38209891107.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 5164 bytes
SHA-256: f34ef6c437480fec12dd801ce55efcd32684a3cb87a13fa93db01c634c2a836b
font_01_sfnt_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 10184 bytes
SHA-256: 9dafdd927c632616c27baddd9935fabbc77463c29ce98286c296078d333cdde2