Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7cdbedae87e033…

MALICIOUS

PDF

68.4 KB Created: 2020-11-14 15:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 47bcf3b7da11c0678d6b325c070f7106 SHA-1: d41691275690f06be4b56731b7cbbcdacfbfd07e SHA-256: 7d7cdbedae87e033b29c9f8b993d8b00a3e511612fe97f7c4cdab9bfbcbe7315
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document designed to exploit users via link redirection.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=kingdom+rush+vengeance+strategy+guide PDF link annotation
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/jewakupudize.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/7579606.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/5774be8886cdf.pdfIn PDF document text
    • https://mozosuroje.weebly.com/uploads/1/3/4/4/134456199/nosifitenenuxadubib.pdfIn PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/3041098.pdfIn PDF document text
    • https://mawebugejememed.weebly.com/uploads/1/3/4/5/134599942/0a9c4d61.pdfIn PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/2386164.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/8631f83e-f411-4e03-bc7d-0d0c1cf69b97/72372438072.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/daisy_quotes_mario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16ef67d-3232-4572-97ef-3781c84cfc9e/48436682524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700c8f78-081a-4d94-a2f8-487b4dda7094/92771723247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b6dcf2-747a-41c1-92a2-7134e5d870bb/7885803324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67fc7c5-9e7a-44d8-8b7b-023ffdd032e0/fizolawosedurubapom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/437e07a1-8466-45ac-b87b-03ee33f623f3/guvokaredojen.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_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 5452 bytes
SHA-256: 523c5cb6ca5eeb5009182157eac0a7373133b29b14566d419a25a131d46aa30c
font_01_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 10632 bytes
SHA-256: 18ed6db4511130e204d8144dd37b196b24d0f33327bf0b67d6c15b338cd43ae8

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