Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f045e04d261edb…

MALICIOUS

PDF

77.3 KB Created: 2021-02-18 08:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5d3e314298432ca473cc025b47e524c2 SHA-1: 44996e79f6501af55c03b299f298adc3e7abb7d6 SHA-256: b0f045e04d261edb0dcaf0d47689e4dd54914588b01e46044a86c5468f65f27c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=how+to+change+transfer+belt+on+samsung+c480fw PDF link annotation
    • https://tidepobowajaxuk.weebly.com/uploads/1/3/0/8/130814761/51b9487c19.pdfIn PDF document text
    • https://famemizi.weebly.com/uploads/1/3/6/0/136006686/3d3af163e94.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/a8fe10d4ff8635.pdfIn PDF document text
    • http://ruginegil.22web.org/definicion_de_dinamica_del_movimiento_circular_uniforme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_601158bb214ed.pdfIn PDF document text
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/xeduwelogukupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426424/normal_5fc826e964f9c.pdfIn PDF document text
    • https://jesipawuba.weebly.com/uploads/1/3/0/8/130874316/5368278.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/aec6c9ee18d631.pdfIn PDF document text
    • https://vejazisiji.weebly.com/uploads/1/3/0/9/130969480/bamawum.pdfIn PDF document text
    • http://myfirstsite.xyz/football_manager_2020_touch_switch_cheatsiwa1d.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/nitatotol/19079633469.pdfIn PDF document text
    • http://jilovin.epizy.com/nestle_lanka_annual_report_2018.pdfIn PDF document text
    • http://puloxivomavari.epizy.com/fractions_worksheets_grade_3_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/35286989573.pdfIn PDF document text
    • http://melaworogafema.epizy.com/html_form_button_align_center.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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 5912 bytes
SHA-256: 2a96612172f42c791d4a6150d66bb5b7429786a8db244ef7d8dbe2ceb7143b2f
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 10712 bytes
SHA-256: 7d111d1016bb88e24a549abd30dd884ab428b0fea3d50394fb86f428779344cb

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