Malicious PDF — malware analysis report

Static analysis result for SHA-256 5739c7bfd24ef39f…

MALICIOUS

PDF

77.6 KB Created: 2021-01-10 07:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a3672dd57f1a65d7bec9787bb1e340c2 SHA-1: f7fa926f6e3273acf4564b272562948637c5c960 SHA-256: 5739c7bfd24ef39f230332e9c079fa7a037bc5bae61f37644e541f3b0742a440
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on various services, suggesting a link farm or SEO spam campaign. 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 numerous external URIs suggest it's designed to redirect users to potentially malicious content.

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://traffset.ru/aws?utm_term=dumbarton+and+leven+reporter PDF link annotation
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/wefuvapilowekomigazu.pdfIn PDF document text
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/dalot_xubezutikopo_pojixif.pdfIn PDF document text
    • https://site-1175981.mozfiles.com/files/1175981/92538370629.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/dededep_vijoripazomuz_zenagukides.pdfIn PDF document text
    • https://site-1167953.mozfiles.com/files/1167953/79779275442.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/zilijirarugepe_nutere_tavukutejoka.pdfIn PDF document text
    • https://site-1175041.mozfiles.com/files/1175041/faze_lyrical_lemonade_hoodie_blue.pdfIn PDF document text
    • https://site-1172175.mozfiles.com/files/1172175/38490550723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/fivekorabeganugo.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/niriwipabiso.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/83371946969.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/45380888107.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/nopos.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/modals_in_the_past_exercises_with_answers.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_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 5128 bytes
SHA-256: 12b6722e449a051eedede6d2d562a66b5874a63c8365dc295f2f8f4926b5a0d4
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 10400 bytes
SHA-256: bd867dff914253183c33e90ea5b6a0f14308e7c254ec5f7d7d769454edf98b52

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