Malicious PDF — malware analysis report

Static analysis result for SHA-256 d365ade87522101d…

MALICIOUS

PDF

73.6 KB Created: 2021-06-08 09:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f83fad4e44e70735877fb5c361c6c12 SHA-1: cdc7ab89fac641e7b74d02465588b2a3e9d91ee4 SHA-256: d365ade87522101d6fda79a5c2a0a36b68f808b516bf24ca8f9041b7851b0f92
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://infrive.ru/pbw?utm_term=action+verbs+worksheets+3rd+grade PDF link annotation
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/e2591a0e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_60beccae7db26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_601fc5fa076e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487902/normal_5fe4fc84144b0.pdfIn PDF document text
    • https://reserekeluzor.weebly.com/uploads/1/3/4/7/134721257/tusadaxa-vexoxewilojefuz-kuposi.pdfIn PDF document text
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/nuxaxewejisalikevu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408709/normal_60aff075b5ea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_604a2f9ac9737.pdfIn PDF document text
    • https://lusewixitakotaz.weebly.com/uploads/1/3/4/3/134385759/5f78b0596da98.pdfIn PDF document text
    • https://sosatiga.weebly.com/uploads/1/3/1/1/131164398/vemijifixe-lafol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5ffba7e6c72a3.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/f7499c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458388/normal_60200a9021e7e.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/dewejugadugux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_6030e032a6103.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/9c87d159-e58d-4226-b8a4-612c9ae0f6dd/is_glee_suitable_for_a_10_year_old.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e9b2f0-4d75-4650-b08a-a3b31e0912ee/saginovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95650c46-8490-48ac-b3de-aea56f9e1b31/matlab_parallel_server_online_licensing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31aa181d-dd03-46fb-b619-a83f69d3185c/wadogivofabemor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0d7780-115a-40f3-a36d-3f64670d54a3/how_to_shut_off_a_predator_generator.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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 5680 bytes
SHA-256: 324862167420fdbfe532a716ab15b809372924fd9e0642ed40c30925761e2c7d
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 10764 bytes
SHA-256: 2486ee425d549478d1a1b32121ad37e02db67b49a6c46fad146b12b56c4299cb

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