Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0e1a6177ed0e42…

MALICIOUS

PDF

70.4 KB Created: 2021-01-16 08:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4490a0d0e008b78601d52423d8755b57 SHA-1: 8501ecf35f96cbde2d74d392c37547fe49f499d2 SHA-256: fb0e1a6177ed0e42315b0e230de457d38ada0ddc26c0d33667076da3efedb851
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, many of which are hosted on disposable domains or point to redirectors. This pattern is indicative of a link farm used to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=gl450+owners+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_5fc73baede568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370302/normal_5fc54305bc935.pdfIn PDF document text
    • https://malotote.weebly.com/uploads/1/3/4/8/134872882/1a5362.pdfIn PDF document text
    • https://site-1187487.mozfiles.com/files/1187487/57713298966.pdfIn PDF document text
    • https://bumopabir.weebly.com/uploads/1/3/4/6/134679094/1be3467.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/a2b8a1decde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_5fbb86fd6fa71.pdfIn PDF document text
    • https://site-1178096.mozfiles.com/files/1178096/40811276467.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/gfmigjc/62717620982.pdfIn PDF document text
    • https://nipituwosaxow.weebly.com/uploads/1/3/5/3/135312928/9a468328cce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fd8b4fa03c69.pdfIn PDF document text
    • https://gewujezugiwo.weebly.com/uploads/1/3/4/7/134754524/lirodovi.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/sesijesule/settlement_payment_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/discussion_on_gram_staining_lab_report.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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 5308 bytes
SHA-256: c1ebe1b8efef7c8718b852629bd45de411eb9cda53bee923ca7b08d78a1254d0
font_01_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 10648 bytes
SHA-256: 563802075c735c6ab4cad248153bc01952c21728bad2e5a5e81097dd42cbcc2a

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