Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ad43f1f5124eb6…

MALICIOUS

PDF

97.7 KB Created: 2021-02-15 14:12:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 768c00528d5f13d4e8bb6be7a5d5e7f1 SHA-1: cd849b97208ae9cd5b103810f0a2a98e2b4b00f2 SHA-256: 53ad43f1f5124eb6fd828852ad21b211180fa6fea2e893cc8de6bd1028c42db9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jottigo.ru/strik?utm_term=why+is+to+autumn+an+ode PDF link annotation
    • http://copyrightnotices-form.com/vopos5rk63.pdfIn PDF document text
    • https://mebugiroxubo.weebly.com/uploads/1/3/0/7/130776511/likinezonori.pdfIn PDF document text
    • https://gefimopawudomew.weebly.com/uploads/1/3/4/0/134017284/1318375.pdfIn PDF document text
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/pininarusisugip-manozexalosop-nizosobux-bufoluvevuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_5fc7a84bc7a07.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/74b19ab8199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5fd636c510b55.pdfIn PDF document text
    • http://lusoxokurutugap.22web.org/70037450243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavuradisaxel.epizy.com/39723218196.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/conservation_of_mechanical_energy_lab_report_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/nefibifatirorififit.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/gupomerodidixowomegijavag.pdfIn PDF document text
    • http://jibogifimot.epizy.com/biledajakovilogagipevijok.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/67313624974.pdfIn PDF document text
    • http://fofapisavinuf.epizy.com/powuvubewabe.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/axis_and_allies_ww1_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/cet_exam_form_date_2019_davv.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_off000142ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EC 5052 bytes
SHA-256: a90e4860c9d90104cb12684d86be5b22bfef6e5b7dabd825d992ee59a7006552
font_01_sfnt_off00015409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15409 11224 bytes
SHA-256: ab26f4ac2198103eacc854047992600405ecfe04ea92e1128b74e28de08535fa

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