Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c823a22553786f…

MALICIOUS

PDF

77.1 KB Created: 2021-01-06 06:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a61e4dbdab5a57930e45ee3da1efc132 SHA-1: 37a0da4d93fdd57aa153daed148f82ea8f53f6dc SHA-256: f4c823a22553786fb93bb0fbfafedebdb140cf16683a6db06fb589f8e2ad2c07
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 S3 buckets and Weebly domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content or download further payloads.

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://traffset.ru/aws?utm_term=blu+ray+player+4k PDF link annotation
    • https://vosuliliwux.weebly.com/uploads/1/3/4/7/134713435/afa10985.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/madetowona.pdfIn PDF document text
    • https://gomamatugapisum.weebly.com/uploads/1/3/4/3/134392688/bufaf_forefowawerawe_katitilagab.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/44444.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/ha1ig1X/5581878275.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/4951242.pdfIn PDF document text
    • https://tufasibapot.weebly.com/uploads/1/3/4/7/134716176/5067802.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/dewutexorob/dadepogoxexuxikozup.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/internet_of_things_devices.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/free_handwriting_practice_worksheet_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/bhd_currency_format.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/all_football_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/online_android_games_with_friends.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/sidoxobisimovexojo.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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 4936 bytes
SHA-256: 9e2067aee685c8d9cdfa2f5c6e714c45d1325103668b560189337404bdc2cbff
font_01_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 10616 bytes
SHA-256: d6a70d8fa2b3decb1c531ea52e5e047f206c820d3f8d475032e90ce7639efd5f

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