Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd7a21545abcf6f…

MALICIOUS

PDF

72.5 KB Created: 2020-11-24 17:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 20b327c0f18994ae299bc145a12a5f7c SHA-1: 23827fd9f0d0be4e044449589872989e4024136f SHA-256: 8dd7a21545abcf6f0fe9788ca50167ef5a33d94e9da0c4ce45f86f94b4f9506c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on link farm domains, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attack pattern designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/strik?utm_term=samsung+refrigerator+manual+rf263beaesr PDF link annotation
    • https://biwulijek.weebly.com/uploads/1/3/4/5/134500127/jakopunimilak.pdfIn PDF document text
    • https://pemogadisazur.weebly.com/uploads/1/3/4/5/134583379/693cbac39.pdfIn PDF document text
    • https://pigupapizot.weebly.com/uploads/1/3/4/4/134480908/jepoxalemos_wipegudix_vejilur_wusiwoput.pdfIn PDF document text
    • https://tonulolini.weebly.com/uploads/1/3/4/3/134341491/133b61942b2c45.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/fafogerolabipo-lifigiraru-repegukev.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/a4f3a98.pdfIn PDF document text
    • https://zelidewa.weebly.com/uploads/1/3/4/3/134371532/ditogebup.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/wegabis_pirone_dofuwatulojapak.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/fa6601a4-ea69-496b-bb58-cbd90b686e40/12205707504.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/lozirenawewesapoke.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/cannondale_road_bike_fitting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/xekalomasikum.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/define_cerebral_aqueduct_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0339a5ba-6568-4cc1-bb88-72edcaf8c8ef/givuweviviwizijog.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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 5780 bytes
SHA-256: 19779172c93f4d37ac077a5f1b39991dd4be0473246e43752a941a3d22d600e9
font_01_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 10780 bytes
SHA-256: 6a1981ec9212e46b24e07995f2e60bf5f3416383d9343a13c3538819c8b62e2d

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