Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b23370dc8d5216…

MALICIOUS

PDF

69.5 KB Created: 2020-12-19 11:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 289b2c7c02fcf2bb4a842f0c904f4694 SHA-1: bebf31975439d1ce20cb5b3b3e0992b5adebd820 SHA-256: 77b23370dc8d5216666cf8610189461307986d98b966b565d9d0ea5235ca1777
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. The heuristic firings indicate it is a link farm designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/wb?keyword=okay%20boomer%20girl%20name In PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/8b6796a77631d.pdfIn PDF document text
    • https://fijozemubo.weebly.com/uploads/1/3/4/2/134234573/3973625.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/2603327.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/ramitajijo_wogobiripiz.pdfIn PDF document text
    • https://baduravimu.weebly.com/uploads/1/3/4/7/134713966/fizeta.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/18b45ff6bcc6a73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5fc9bfeb03652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_5fc080fc8de78.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/fbf2535b-8abb-4a70-a629-5f637cac7a5b/82256822704.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28a83ea4a794d564f921d/t/5fc9fa3a41142a3c4b432f3e/1607072314983/nemupovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e2b097-98ec-42cf-aa22-2d099d3470d9/summoner_the_novice.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc81a80526ad1a5999a26b/t/5fdcf5aeb05c7d6df91b83ce/1608316337263/beach_background_images_hd_free.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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 5160 bytes
SHA-256: fe8a75c27eee6b65a418ea8587630a6f02f7dfac4c6d048c45f1e856a2c0ecd9
font_01_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 10544 bytes
SHA-256: 21a8a89a90f692237ae88ebd92055c682726d4ced2ce9986d3b914fbdc30a880

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