Malicious PDF — malware analysis report

Static analysis result for SHA-256 619a11d240cb29e3…

MALICIOUS

PDF

72.1 KB Created: 2020-11-23 10:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e1e2bf077cce926d5a6097dda04f95b5 SHA-1: b3490f3697715ade16a16093ab94ddc86917ed2c SHA-256: 619a11d240cb29e3625fb8a2f7075386c308df87c8566a5ade19649ea03740f2
136 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 lure related to 'Fossils worksheet answers' and includes a high-severity heuristic indicating an image lure linking to an SEO redirector for phishing. The embedded URL 'https://traffset.ru/123?utm_term=fossils+worksheet+answers' is identified as a potential phishing redirector. ClamAV also detected this file as Pdf.Phishing.Trojan.

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
  • 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://traffset.ru/123?utm_term=fossils+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f8abc6a59a0b.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/5251891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f92f99dd18c7.pdfIn PDF document text
    • https://sezitoxonuga.weebly.com/uploads/1/3/4/8/134886233/sajagenepexinozugake.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/jakadaworulozazur.pdfIn PDF document text
    • https://judixanasagik.weebly.com/uploads/1/3/4/6/134688655/4293214.pdfIn PDF document text
    • https://takibuvekinapix.weebly.com/uploads/1/3/4/4/134456834/kikig-wuwixafiguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5fa1d0beb9a5f.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/joterige/4845839953.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/firemaking_calculator_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/case_files_family_medicine_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/nitasebibikinexuxawito.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000e757.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE757 24840 bytes
SHA-256: fc6d22965672b2acb1c0cb179ab89d27a22e98d49c34e501d9fc5a24f20c8e52
font_00_sfnt_off0000b7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EC 4884 bytes
SHA-256: b1f4555844f5a1aa707dc9d58a08a7ccebe8810a8a6acee7df3675b5db0cefb5
font_01_sfnt_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 8944 bytes
SHA-256: 7bffdfd7862263342719ad50d05162474feec9e806e86bbef037f3902a688540

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