Malicious PDF — malware analysis report

Static analysis result for SHA-256 a565befccdbff7cb…

MALICIOUS

PDF

68.0 KB Created: 2021-02-16 03:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7b2fe5912d022bb5efce2b065f6e3382 SHA-1: 4cce9b4b01d54494ab9cd5610aae62cece93c60a SHA-256: a565befccdbff7cb30bc0622eca69613cd12e693375fcaadc373f24b87f3e88f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggest malicious intent. The presence of external URIs and the overall structure point towards a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/strik?utm_term=boss+br-900+cd+manuale+italiano PDF link annotation
    • https://cdn.sqhk.co/mifigatira/dhhrTDu/41891614101.pdfIn PDF document text
    • http://walletelectrum.buzz/blue_red_balloons_clip_artwlr6v.pdfIn PDF document text
    • http://indonesia2health.online/megowadevzon3.pdfIn PDF document text
    • https://cdn.sqhk.co/gorisaburo/eGjhUhg/39219533796.pdfIn PDF document text
    • http://hookup153.online/how_to_see_last_number_that_called_on_nortel_phonekchmm.pdfIn PDF document text
    • http://tutulobos.22web.org/zejevuvazuwika.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/Vjjgdii/65456704624.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/soy_tokyo_2020_ticketsvz866.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/fUb4nDd/survival_prison_escape_v3_mod_apk_download.pdfIn PDF document text
    • http://rankingcoach-seo.com/legopatugemovogakokoo4d53.pdfIn PDF document text
    • http://zoomita.fun/quantum_cat_by_sarvesh_kumar_vermabd0a8.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/iebiaEB/free_jibjab_account_code.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/jhciget/93534907303.pdfIn PDF document text
    • http://getcreditreport.info/15996216727dgpu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulavutimomoxu.rf.gd/casio_f-_91w_watch_manual.pdfIn PDF document text
    • http://lepefefila.epizy.com/buluxuraxuxaxirelu.pdfIn PDF document text
    • http://nupozefujelo.epizy.com/fexuzoxoxi.pdfIn PDF document text
    • http://bopufadepop.epizy.com/12130670603.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_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 5604 bytes
SHA-256: 8ffed9afd4aa4847b94bec0a2a120288ac344ba9b2ce090892e0c3348ec2c219
font_01_sfnt_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 11256 bytes
SHA-256: 0f0a23107420c700c52e40581177fbb5d08542b7cd343a5a8f4076672d18bcb9

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