Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cebfb8fd20f6de…

MALICIOUS

PDF

79.7 KB Created: 2021-02-15 06:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b3c5bf6a037785fe5df59f1fccc1a6ab SHA-1: df8382f9fc24783882307fdd1f9de7667be6b496 SHA-256: 58cebfb8fd20f6de64a306ba74fc31efa8f9d0cc8d61cfdea00e0cb337ab0a42
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, disguised as a resource for "regression stata panel data". This indicates a phishing or scam attempt, likely to lead the user to a compromised site. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/wix?keyword=regression+stata+panel+data In PDF document text
    • https://cdn.sqhk.co/kufiremikaf/oP7Agio/5165234041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_5fe924f719d82.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/cidZ26d/bubble_tea_kit_target.pdfIn PDF document text
    • http://fb-copyright-help-from.com/tedajikewuritetokky60.pdfIn PDF document text
    • http://roskycnmx.com/71116226228bqzfr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_60225b8fd0f5d.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/ggjjR4Z/fast_food_arkadelphia_ar_restaurants.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_5fd3204cd11a7.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/NawzNhi/66791412973.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/kovezux/diy_face_sheet_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/zezemenidezurorasanexinu.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/84766992765.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/mipudibadukap.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/wimiti.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/67216848490.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/dafetevametowopujaxekew.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_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 5132 bytes
SHA-256: dc1b6bc92a8db2482645d42bb69eddd7d5b1282ac6d9da307a6a2b10c40abe30
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 13184 bytes
SHA-256: 87492955f372db352343f5aedc5d717b4ae5db31d98b0fdbc2d495a11fd362a5

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