Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14e290d2867d1ba…

MALICIOUS

PDF

67.5 KB Created: 2020-11-11 20:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d9903e515f0a5f63a7feb370c80cc98f SHA-1: b19a465784b93a6046542c85bd38e0b91edeafe7 SHA-256: c14e290d2867d1ba30612b39705b9015d4f831f0078efb456f99ce14768ffddf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URLs suggest an attempt to direct users to potentially harmful sites, masquerading as educational content. While no scripts were extracted, the presence of numerous external links, one of which points to known malicious infrastructure, indicates a phishing or malware distribution attempt.

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.
  • 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://traffmen.ru/aws?utm_term=solving+linear+equations+pdf+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_5f9bc7d21221a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_5f9b5fdc83813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f956d092829c.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/9c8a6d23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_5fa357fc7f40c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_5f98a0c7cfbd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5fa4826a06e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5fa42b5853c5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5f990e1c9a081.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/xafuluxel/kumevututemorojikumud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6731073c-b422-4905-a38b-47bbaaccc196/xekolafasegovutozare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943f9153-b33e-4f0e-b074-2bda9832eda6/jowuxowobuji.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/nuviwivibelubidedure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfbb961a-b14a-4d14-b6f5-b50b343771d1/songwriting_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098a3b58-434e-4f20-bdb0-0664d353c3d4/dunuzadapubebib.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_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 5748 bytes
SHA-256: 81a4606fe96a1e64e101c995c6793c1fd4516f765c405a30a09d250f164c735e
font_01_sfnt_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 10472 bytes
SHA-256: ba559e225921133bcb96a15a95127bb42d47d8f330eb600767bbe8f962670002

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