Malicious PDF — malware analysis report

Static analysis result for SHA-256 5086b86a90d1ec16…

MALICIOUS

PDF

71.9 KB Created: 2020-11-13 23:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6cfb0829f07b98ac830ad29e94571c0c SHA-1: d1d84183239c326493d94044eb82bac8a12ddcda SHA-256: 5086b86a90d1ec16fe03860460eab256be8941429e7a745abafcdd8f49cba61f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'Senate and house of representatives', suggesting a lure to impersonate official communications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=senate+and+house+of+representatives PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448328/normal_5fa33c0ee4488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_5f8ca1d3b7802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fae63068e325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5f9d3250241b0.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/dc3532089850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_5f9e03bc0a9b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/36372028428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6867311-ee69-45df-b32b-a950d4b2bbaf/2791659378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4fd6a6b-10bd-4b98-9188-1cd1b6d71356/xirixona.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/dajoja.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/92865126976.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/naxifuvukoletojuxusaxir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 5140 bytes
SHA-256: f620e1fd81cd621bf5a5cdc09d1a758ade974a41790b51910653a00cfffaf376
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 10236 bytes
SHA-256: 3ded2b0ca5d8d0b57768886868c770e62b895f3787bf23faf51b521d27e1a36f
font_02_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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