Malicious PDF — malware analysis report

Static analysis result for SHA-256 1317b52fe036ca66…

MALICIOUS

PDF

119.9 KB Created: 2020-11-25 18:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 790f8e7316d07551e6a4c6c6a0c11521 SHA-1: 11bcd54c3af3f02db5c37e9df0424fcfae78f91b SHA-256: 1317b52fe036ca66cb4c1d8dfb0e8d227a8303200f77d2bf70e85405c2d432b7
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?utm_term=molecular+geometry+report+sheet+answer+key In PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/e3dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_5fb2bb153772a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489042/normal_5faa62498361f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_5fa09d5ab6faa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466408/normal_5fb2e06cc8ca2.pdfIn PDF document text
    • https://kelipibefis.weebly.com/uploads/1/3/4/5/134500531/10284cb0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5fb6caad722bc.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/gedimuta/pokemon_tower_defence_2_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/ponaxewudi.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/19049598329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839caf02-7b79-4802-a4ef-83d7b6037929/bible_commentaries_books.pdfIn PDF document text
    • https://s3.amazonaws.com/nozazodivin/unblocked_66_games_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/49173551192.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FEC 5612 bytes
SHA-256: dfae583456667f8e8ccc84b7160a3c712271e0c2af74d6fe1d500bdcf6301b8c
font_01_sfnt_off00019306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19306 12140 bytes
SHA-256: f414a51f7738575def7d9d2b44b3cc749613e2d589c607952efb673e03a8998d
font_02_sfnt_off0001bcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCB5 16152 bytes
SHA-256: dc3267dfa341d762c2f2268b1ef0710c504378cdbb4f4c8a5261a6f1195c1e2c

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