Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b45085ed3cd9b34…

MALICIOUS

PDF

92.6 KB Created: 2020-11-10 12:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b71902dd9545ecc1631132f5e1dfdcb3 SHA-1: d342f84d391bfddffbbcf9b120b2cde727bd4221 SHA-256: 2b45085ed3cd9b347cbe2c844a83afb545651ae2c5ab2412754b1ed9059564ba
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, with one identified as a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm structure, likely intended to direct users to malicious or spam content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest a phishing or redirection attack, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?keyword=blood+meridian+cormac+mccarthy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_5fa1aef3bacb6.pdfIn PDF document text
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/novijefepi-kiregi-karugugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5f9251ba675f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5f9a05a53cd37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_5f9f74b2d0b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453337/normal_5fa6312db7bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5f9b20474c18e.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/lupebesu/manifest_destiny_map.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/geometric_sequence_examples_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/41879138000.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_off00012fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA9 5152 bytes
SHA-256: bed2285cc25b9744ee677b2f42cda341d7ff4eca1b7d26f01e99b3cb3b3d7a7b
font_01_sfnt_off00014107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14107 10840 bytes
SHA-256: f04cc416c4fe1d1a7cb0e036fee1844f8311f2c4ed7abe738fc4451a23c0a0e5

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