Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d817337c4f5e5b…

MALICIOUS

PDF

80.5 KB Created: 2020-11-26 01:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4609ff3e53fb92ed964270d5ffc18770 SHA-1: b30c872a892f506df82545a8c18a1cb15bf54f78 SHA-256: 49d817337c4f5e5bf4a7bdc7a176cad9203fb5f728743ba4db48058e43f1c8bc
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by multiple heuristics, including critical alerts for a malicious redirector link and a PDF link farm. The embedded URL points to known malicious infrastructure, suggesting an attempt to lure users to a compromised site. While no scripts were extracted, the PDF structure and link farm indicate 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://ggtraff.ru/strik?utm_term=ktm+dirt+bikes+for+sale+near+me In PDF document text
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/44622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_5fb74ea2f1bd3.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/4384628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb78539-27e8-4796-a05b-2e9b2b52fddd/wimaxozoritobajovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/354a7271-9928-4080-8475-db601b3246ad/before_i_let_go_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/17332707749.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/74603515809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42719154-e9f3-472c-bb77-4d6938ae70c5/gai_gia_lam_chieu_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6a24b2-42e3-4739-bc6b-da62f2ba502c/felesawoxukavupute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaaae6e4-9140-404a-a7c3-09f8ba645878/56477371487.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/71962101698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae54ec7c-ffad-41b4-bb63-ac51baa2454d/ford_stereo_6000_cd_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6182858c-a56d-419d-9da2-89fe9468e008/occupational_therapy_examination_review_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/canada_visit_visa_form.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_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 5224 bytes
SHA-256: 526314c35055abbf892de387354e788225081b0abbcccffe5a01dfdeb9216665
font_01_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 10380 bytes
SHA-256: eb70bc8cd6457032b91b0671122d211000d2537349a8c52c643d2ef2050a5cfe

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