Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ae1a219751a6ef…

MALICIOUS

PDF

77.2 KB Created: 2021-02-14 21:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c31277dc6bb723afafdb9c1fd6076a5d SHA-1: b0f91148a3a7c66ffcd256ad5e1d325d09cc8033 SHA-256: f9ae1a219751a6ef1a0ea617acfcb3c474ee45d6177886fa6e5270fe4fb6cf67
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 that redirects to a known malicious domain, identified by multiple heuristics as a phishing or malicious redirector. The document body, though heavily obfuscated, appears to contain text related to school uniforms, likely serving as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=school+uniforms+diminish+students+individuality In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_600ce819cbcd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5fe8b8fcd9fae.pdfIn PDF document text
    • http://tublitalia.fun/electromagnetic_attraction_type_relayyojn5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_60140a44c6f3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391024/normal_6004edc9f0e06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5fcba239d4b4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368949/normal_60015aa182c23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_600e31d7447ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5ffa0e3526c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_600eb448f1ee1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zomuzigo/bazaart_pour_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/zepawoma.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/43793526771.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5408 bytes
SHA-256: 19f9b760994b3acbc063ab8e24f6df4a0d2c1f49f0a97e744119204eb358d53c
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10252 bytes
SHA-256: bd4443725d591bbed1221eb1a279e60f15398f4c76e2468f1fa8986a41714eef
font_02_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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