Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7f1c77f3770221…

MALICIOUS

PDF

77.2 KB Created: 2021-03-15 00:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3b5b443a30cac0d98d781863dfd867d9 SHA-1: 29cab0c8cd2658be3f924f2bb3a08f41f866110e SHA-256: bc7f1c77f37702216f94f2c4daa23cdfd9c8cd13f4c58bf7f96ed3bcc1fbce27
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a prominent one being `https://resalured.ru/strik?utm_term=totaline+thermostat+p374+reset`, suggesting a lure related to product search results. The PDF is also identified as a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=totaline+thermostat+p374+reset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406812/normal_6049259b463f8.pdfIn PDF document text
    • http://pijabaralipori.22web.org/xubek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fc6647f54924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_60461ae6e0578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_6009d8bccfc43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_601b1bd62dea2.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/92660066218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_600b23c0548bb.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/what_is_a_rehabilitation_care_facility.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_601c6a2038d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_603225a715ed7.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/b_d_singh_genetics_download.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/scag_walk_behind_mower_prices_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevudavef.rf.gd/lewuporelinuvigin.pdfIn PDF document text
    • http://ronufoju.epizy.com/chhello_divas_2_full_movie_free.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/95445073887.pdfIn PDF document text
    • http://foburug.rf.gd/biopsychology_john_pinel_free.pdfIn PDF document text
    • http://todizegi.epizy.com/4_lines_worksheet.pdfIn PDF document text
    • http://milisepidug.rf.gd/groundwater_sampling_guidelines_epa_victoria_2000.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/lulaja.pdfIn PDF document text
    • http://karajifaderiwow.epizy.com/free_natal_chart_report_cafe_astrology.pdfIn PDF document text
    • http://siromalezevupag.rf.gd/didagobifeluworizatu.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_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 5340 bytes
SHA-256: 52fe738a6b79ec61ea5371e65262461a5192b70b443d38ccc44efce6f4d5cc33
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 10648 bytes
SHA-256: bb32ea40a9fa0a96653588120d88510bfdeb756181905ceeccfc15161e497326

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