Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45b127541c18af6…

MALICIOUS

PDF

80.9 KB Created: 2020-12-15 20:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1e7a57f60e0247c5d2951787ba08e4f2 SHA-1: c36a0c6228c308617a928113836a298673d2e5a7 SHA-256: c45b127541c18af614e79169b35538b4f6df08ba533d6225f683ffb474aea216
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to disposable hosting services like Weebly and redirector infrastructure. The presence of a known malicious redirector URL and the sheer volume of links suggest a phishing or link-farming campaign designed to lure users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=burswood+acoustic+guitar+strings In PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/garifa.pdfIn PDF document text
    • https://xotituwidekave.weebly.com/uploads/1/3/4/5/134585458/545bddf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5f9771e1e50c4.pdfIn PDF document text
    • https://zevefexa.weebly.com/uploads/1/3/4/7/134727867/5a45006a2728f.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/4357687.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/jumiwa_mijukatojejam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f905b6962181.pdfIn PDF document text
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/dasud.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/1544317.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/vuwemavepebovi.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/80d7e0de-4697-4b27-8a6f-ae526278a847/39339686714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a29adf-380f-4419-939f-0f66bb843310/73268370744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d24e947-6cc7-40aa-9403-47095fa3e4ca/kenibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f79c7f-386b-42d9-861c-ad7578e86306/parallel_and_perpendicular_lines_geometry_project.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/general_knowledge_questions_and_answers_in_tamil.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_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 5216 bytes
SHA-256: d69aa9a1a730f902be242835ae0aa012bef5cefbdf7d8c093c70bd554e65e88c
font_01_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 12180 bytes
SHA-256: 015b5487e0d9e8dbb24d781429ddf803f74485f7bcda6ff4f637fa237d12f7d0

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