Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a1d71de495a372…

MALICIOUS

PDF

68.5 KB Created: 2020-12-17 04:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2d453fdb166a622ad856c847f4470a30 SHA-1: 92958112a6ee2a32da4298094dfba650636d5756 SHA-256: 52a1d71de495a372fdbd8227b80c07565f1d059259a5aa713579c337cfb50112
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'traffnew.ru/strik', suggesting a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV detection and ML classification confirm the malicious nature of the file, likely related to phishing or malware delivery.

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://traffnew.ru/strik?utm_term=im+on+a+boat+lyrics+video PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/newobamolomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_5fc155313752d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc56b7cbf71053ccb2dfd66/t/5fc7e0a80a80c24503e2d447/1606934697393/6487372322.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc791041a9b7f6479384afc/t/5fcd0409d336b863f0c5ed11/1607271433280/toxojowidajokopo.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/retemizerulawemaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b360e15-2717-4276-a7cb-1f41bad4eef9/60773636260.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/dies_the_fire_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef47f28-3552-4d53-b07a-8b623c08daab/83479905951.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4cf626609fd0ee7aa7f01/t/5fc59eb6f8cdb769c6a51e8e/1606786743430/45609612089.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/corretto_java_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa2fdfc-3e1f-4a34-999d-86adfa84659b/subezarudubivavi.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/nipomesalozukufoxogib.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/sonic_all_stars_racing_transformed_psp.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_off0000cdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 5324 bytes
SHA-256: 4ed39f0f65bd351cd7ed7831a2c7a62530ee2a88985873293b208f21c7f2da15
font_01_sfnt_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 11028 bytes
SHA-256: 906bd2aa9a4c8853cfc555156cc9c91574d0167038ff2eee61fe5bd8368dc962

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