Malicious PDF — malware analysis report

Static analysis result for SHA-256 55723d6d3cd3c3c4…

MALICIOUS

PDF

94.6 KB Created: 2021-04-21 19:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 188cdf7d7561975bbb48699a1134bd98 SHA-1: 8eba6204c890fed465477b3c44882817f85722f6 SHA-256: 55723d6d3cd3c3c47670ea8771375151bd8f95a54114d7c671d4478470ef1332
244 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external PDF documents. One of the embedded URLs, 'https://crophysi.ru/strik?utm_term=what+can+you+conclude+about+marbury+v.+madison+%25281803%2529', is identified as a malicious redirector. The presence of a large number of links and the use of a malicious redirector strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+can+you+conclude+about+marbury+v.+madison+%25281803%2529 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4464707/normal_5fc8afd652ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466165/normal_5fdb86f9a0f05.pdfIn PDF document text
    • http://jajokojunewi.mypressonline.com/boolean_operations_on_objects_in_computer_graphics.pdfIn PDF document text
    • https://zuwejuropuri.weebly.com/uploads/1/3/1/6/131606208/3999255.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/enadu_news_paper_today_ap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487894/normal_603ccc94c6601.pdfIn PDF document text
    • http://jelolizabuvixi.22web.org/championship_manager_2010_android.pdfIn PDF document text
    • https://dinumaditu.weebly.com/uploads/1/3/4/4/134479473/6081973.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/ea40bab6ed92fb9.pdfIn PDF document text
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/fiwukunukade.pdfIn PDF document text
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/femananamoweno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fde23653be53.pdfIn PDF document text
    • http://luzupogakij.sportsontheweb.net/human_anatomy_laboratory_manual.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/qasida_burda_shareef_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_0281165502d74d2594de9430279a39b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0cd5de-7ca0-4a3a-a1ef-ae9ddb911994/wilajugolekusutijuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d5bb33f-8cd2-4ca1-81f9-88e39db9e8ba/cosco_scenera_next_dlx_convertible_car_seat.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_2fbf2bf2ee924deb9f62b18aa1acf0e1.pdf?index=trueIn PDF document text
    • http://tutunod.epizy.com/cake_decorating_beginner_s_guide.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_b444917822b44954ae48215018aecf89.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_94b596de120748f2af0dbe6282e67027.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_d1f7f399dc74421bb2b525f6188c87d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e10e61f-c39d-4776-9c05-f15338aa8d2a/m_audio_keystation_pro_88_dimensions.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/what_do_esc_beeps_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715ab229-1219-40f4-9a7f-a5c997f80b88/difasar.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_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 6232 bytes
SHA-256: a090d74229633bd79243c9ba14569d11c974f78569e5279831e03e8ac1086d7c
font_01_sfnt_off000145b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B8 10708 bytes
SHA-256: 2707b9d67d287a7edf2973e07d0d5da152ebf81e5ab00aaf2fd5dc8a47da3472