Malicious PDF — malware analysis report

Static analysis result for SHA-256 90644fd4f574deb2…

MALICIOUS

PDF

67.5 KB Created: 2020-12-02 19:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: daaaafbc1e80684a148a3d1d92216aa7 SHA-1: 2f1aa96c34b14b0f2ac2795724c7725e5162ca20 SHA-256: 90644fd4f574deb200683dedb0c94c28d9e7c0538a376b0082ec06c2716c9d1e
194 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'cardboard sheets for sale in johannesburg' and embeds a URL that redirects to malicious infrastructure. Heuristics indicate this is a malicious redirector link, and a machine learning classifier flagged it with high confidence. The embedded URL is the primary indicator of malicious intent, likely serving as a phishing or malware distribution point.

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.
  • 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://gettraff.ru/aws?utm_term=cardboard+sheets+for+sale+in+johannesburg In PDF document text
    • https://cdn-cms.f-static.net/uploads/4499942/normal_5fc05f6e97408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_5f94670b55fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f8c58764e9d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_5fbafb086a61b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_5fb330961cb01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5fc75f4ce0e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f89ad4f30c96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5f9c36dc47148.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/72ee1243-db0c-4836-be4e-484cd3fce75b/college_physics_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/hangings_after_nuremberg_trials.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/free_manual_j_load_calculation_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07a43e4-5e32-4443-a2c1-b4e70c464cb8/147360316.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_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 5288 bytes
SHA-256: 698214c790b6200dff0a6d198d469573a8e5d5a4920977838efbf318f00caca5
font_01_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 10816 bytes
SHA-256: 0d626888e58a5a02210a6951fd5a1b1b21ac0cef92c49acde623638cee18abdd