Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11dc061e35efba2…

MALICIOUS

PDF

63.2 KB Created: 2021-01-31 01:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 233567b51fd7f03def04849fd09e97ee SHA-1: 7365fc3019a7ffffbccf0e8a4842c5f69f7f0704 SHA-256: b11dc061e35efba20093328b63304a0de710e2e93d07b7d1b146ac5d7069c402
126 Risk Score

Malware Insights

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

The PDF file contains multiple external links, including one with a 'utm_term' parameter suggesting tracking, and is flagged as a link farm on disposable hosting. ClamAV and an ML classifier identified it as malicious, specifically a phishing trojan. The document body, though heavily obfuscated, contains text related to baby names, likely serving as a lure to disguise the malicious intent of directing users to potentially harmful websites.

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 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://jottigo.ru/123?utm_term=baby+girl+names+starting+with+sree PDF link annotation
    • http://bonifacy.site/t-sql_fundamentals_3rd_editiontgd6z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5fe02761cb043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fdfae2e5e4d8.pdfIn PDF document text
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/7057678.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/xenokap_gugugi_ligunazifuv_zurabavakaze.pdfIn PDF document text
    • http://dimax-matrasy.ru/tecnologia_de_informaoua6v2.pdfIn PDF document text
    • http://reduslimitaly.website/red_rose_tea_figurines_2019hve6z.pdfIn PDF document text
    • http://card2card-perevod24.site/jexadegekoxatugodo02j03.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/jogib.pdfIn PDF document text
    • http://tenakotete.22web.org/xowisomijereda.pdfIn PDF document text
    • http://agreevudb.rest/47518242265py4v9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5ff4f0a08801a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fe74e5c7cdb3.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/6372786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_600d4b532900f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidexegope.epizy.com/19640150586.pdfIn PDF document text
    • http://newewixojarulup.epizy.com/29236911638.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_off0000b912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB912 5484 bytes
SHA-256: 4919776ccd62b82d707664cc865ea03d680e3b8aab6f9005b0f96fe7b840bb8d
font_01_sfnt_off0000cba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 11108 bytes
SHA-256: 05ae09a3259512e36d9462bbcc91afede0c2dc1ed72ef04f9cafb29cae498e0b

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