Malicious PDF — malware analysis report

Static analysis result for SHA-256 46755669e4b17e72…

MALICIOUS

PDF

88.5 KB Created: 2020-11-20 19:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a80c84ac24e9eaf40f57052839c0f2f0 SHA-1: e2d435ff2ede3ff158f998a967b74da43242ecb2 SHA-256: 46755669e4b17e72e0d9cc11813b59155bfcdc376dcb6633d46bb36fa9f25568
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the primary purpose is to direct users to potentially harmful websites. No scripts were extracted, but the presence of numerous external links strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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/123?utm_term=making+tables+in+latex+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5faa5b2bbee6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5fa59bb0dcbab.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/575296.pdfIn PDF document text
    • https://zupudawuliwubil.weebly.com/uploads/1/3/4/2/134265939/a08727d100f73.pdfIn PDF document text
    • https://zemexiwum.weebly.com/uploads/1/3/4/3/134330210/1394048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f9d7f034805f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_5fa6dca7b17dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5f8960ac62938.pdfIn PDF document text
    • https://ladasewesadil.weebly.com/uploads/1/3/4/6/134665294/darurew-nawixalo.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/bubeto/60311204353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bbf997-7eb2-4fcb-8bb5-07151846cf98/movavorujujuxim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf122f5-07b2-4055-a407-4eab14836067/jivofokuzabapitomesiz.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_off00011d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1B 5032 bytes
SHA-256: 068872d08175e255956a51ce7936547e58436611e8670948e48959b2c9456e0f
font_01_sfnt_off00012e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E69 11536 bytes
SHA-256: 0f757f9b79c130ba54be5f1467057b66c8beda195b1e86cdebced35adbda652e

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