Malicious PDF — malware analysis report

Static analysis result for SHA-256 465c581499814aff…

MALICIOUS

PDF

68.6 KB Created: 2020-12-24 06:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 33644384ef87a7dcbbbb1766d13ce4ed SHA-1: 9eb50f644126f2074e6f2660e62a31e0e5c6546b SHA-256: 465c581499814aff2e2edbb6253e4cf0f7e76cf2be79ac93b95740f233f2cd71
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file, disguised as a brush lettering guide, contains numerous external links, indicating a link farm or redirection scheme. The presence of a critical heuristic firing for 'PDF_SEO_LINK_FARM' and the detection of 'Pdf.Phishing.Trojan' by ClamAV strongly suggest malicious intent. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution campaign.

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://traffnew.ru/aws?utm_term=the+ultimate+brush+lettering+guide PDF link annotation
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/xejeve-zegizemusakuzed-torexobetav-zuruna.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/totamitagojosupeviji.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/nixigix.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/40ddfa4d7f4e3e.pdfIn PDF document text
    • https://maxokafas.weebly.com/uploads/1/3/1/4/131406275/tonuj.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/webipejonavuv/porumipumed.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/89452089919.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/26076573521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ae5c8d-7988-41dc-8b93-bf972ad1f405/fuzulowarabotiporufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6052205-243b-4fde-90f3-82e700c7537d/kiss_the_rain_guitar_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/42748321010.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/62706810009.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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 5328 bytes
SHA-256: 497c9cad43b27b5004ec539216ad57fcd501bb39dcaf2d54e695849cbb2ceab6
font_01_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 10224 bytes
SHA-256: bc9bd1b965c3fc562e2c5e740d5b632905c46fb7f76b59f9b80589f8f20f4825

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