Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b9edd6e23d0d30…

MALICIOUS

PDF

71.8 KB Created: 2021-02-28 02:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4be68c6d3112f33fb1639e0e5390489a SHA-1: 62f10a5f1adceea3ee71f954da1a6537aa7d02cc SHA-256: 11b9edd6e23d0d30e4674d83fb7f173cc87a710dc0b8e3ec01327e2407a88c95
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with several pointing to potentially malicious or SEO-manipulative content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://ponafet.ru/wb?keyword=do%20mobile%20signal%20boosters%20work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413456/normal_601a338a7549c.pdfIn PDF document text
    • http://doorstepcomputers.com/the_official_sat_study_guide_2020_edition_free_download3m8tg.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/misixutefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408721/normal_600e116e1217c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_600b21aaaf5d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_5fe6ed7cc5f0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_601cdf03e4626.pdfIn PDF document text
    • http://itnegozio.info/18331811682patcl.pdfIn PDF document text
    • https://xefikusog.weebly.com/uploads/1/3/5/3/135390274/6806910.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/9172632.pdfIn PDF document text
    • http://peludofnor.fun/enfermedades_de_los_cenzontles1t3c8.pdfIn PDF document text
    • http://storeeuro.info/kiss_the_rain_sheet_pianoa62xi.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/tirimofufemukat/zewejatoruwu.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/gst_new_tax_slab.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/disgaea_2_beginners_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/math_fraction_addition_and_subtraction_worksheets.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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 5300 bytes
SHA-256: 8948643952d4be400e083c136dbb453d7fdae6491f594a0f3ac9f364d2792b8c
font_01_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 10044 bytes
SHA-256: a27b9bf50f1d264dc5bc71af5b5dcc04740492d21284625636ca7a4aa0e13cb6

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