Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f35e42b68aa32bc…

MALICIOUS

PDF

67.7 KB Created: 2020-11-19 09:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0114bbc135fda281e255afb881331f17 SHA-1: 2c5b85250a91edda4e7e99eca2a37d6dbc6e8f18 SHA-256: 1f35e42b68aa32bcc96fdc2abed070f5e184ee6df0f21a155c68cb66d6edb3ae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to reference a Bosch dishwasher error code, likely a lure to encourage users to click the embedded malicious links.

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://traffking.ru/strik?utm_term=bosch+dishwasher+error+code+e15 PDF link annotation
    • https://rilebowiteb.weebly.com/uploads/1/3/3/9/133986594/8977051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5f934f2573813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f944c2a9b064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_5f8f9a1711ba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fa4b15672db3.pdfIn PDF document text
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/datakote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5faafca3577cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f22488-dd16-4907-a372-baa1c0396fc4/51030671713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30506a3-f5f3-4ff6-a9c7-958d77aa011b/16499344904.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/famisemexu.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/aquacal_heatwave_superquiet_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/kirchhoff_current_law_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1b9999-32d6-40ca-ac24-c23b6a35bb94/88282389732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29802b89-87f1-43a0-8cb0-d0c888e03c66/shamar_prophet.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_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 5312 bytes
SHA-256: bfb5432e6bfef7feabb291b174fbb87367b56eb834a91cd7acb1c816eb3a7f88
font_01_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 10936 bytes
SHA-256: 742bc78e0f6f764d7c788c689fbc8ef0c2200a9c1cf5db592edb2ea1561257e6

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