Malicious PDF — malware analysis report

Static analysis result for SHA-256 1590371d47e7676a…

MALICIOUS

PDF

72.3 KB Created: 2020-12-06 02:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 548875d3d14d24f520690482b91d4d5a SHA-1: 91a89eac603237027b9068328a6cf27ca85a9e4f SHA-256: 1590371d47e7676a40a1c91861ac39f53282967d7d6b8088e1f2581f12b42641
194 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://traffine.ru/aws?utm_term=engineering+manager+interview+questions+and+answers'. Heuristics indicate this is a phishing lure, likely intended to trick users into downloading further malicious content or submitting credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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.
  • 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=engineering+manager+interview+questions+and+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5f9f3b4074422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f8762562ea3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5fbe7deea0f1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d350bc6-833a-481f-bb7e-990801d36051/return_man_4_quarterback_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/nba_live_19_companion_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae72bfc-c6be-4d49-ae4f-09d05e857dae/jiveredifesekisefulu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc013b624b06a7eb3fa8a9b/t/5fcba6ea66ddd570b0fa0336/1607182059713/gevosixiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8312c5c4-2a94-4e2f-8a5f-d362affee0a5/43087335312.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/terraria_calamity_ankh_charm.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/bejapotabuleze.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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 5348 bytes
SHA-256: 5ca78902bf96008385c9c80e9e60e64222284fb7d25d7e1fea05ea92e3d1fb4b
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 10168 bytes
SHA-256: 1ce3b73be2df1732d4c9bd92b84fc262bac2034b243e62bae1141a796e5ce520