Malicious PDF — malware analysis report

Static analysis result for SHA-256 d945390513e40420…

MALICIOUS

PDF

66.8 KB Created: 2020-12-24 03:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1a3166c7b57edd4540120e50eb523664 SHA-1: e68acbf8fda42dafc45a8f0589ecd39cb1bf19da SHA-256: d945390513e404203936556e6a4ce61a2223528f606f5b11259a73b0942417b0
136 Risk Score

Malware Insights

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

The file is a PDF that contains a link disguised as a document download. The link points to a URL that is flagged as a redirector, commonly used in phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=duties+of+a+pastor+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5f8c88c84a794.pdfIn PDF document text
    • https://cdn.sqhk.co/lepezusija/7aiiSsx/slot_machine_meaning_in_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f8995dad92dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_5fe17c6102ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5fba0c80d998f.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/jofunozuzof/6th_grade_science_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/movudipewujoketuvagama.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/5907031040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c40b922-dfd8-4059-9b97-a63c80e03e19/deranuxodemotezatinop.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/encyclopedia_judaica_vol_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590fff8e-c9f9-4c58-b1c8-e2b05471e2c6/rhythmic_gymnastics_ribbon_moves.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/12969086608.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_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 5004 bytes
SHA-256: c36bb76dddeedeebfc359a8b6aa68a421581d3118758057427942f7b96a37769
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 10516 bytes
SHA-256: 18618cb6b326b0d00cd288635d7f17efb5f5cfccf520a848ce7d49d7a60139ce