Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d28be759bcac559…

MALICIOUS

PDF

74.4 KB Created: 2021-03-08 05:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fb4c8cbb23e68e51e4713c192e1a4826 SHA-1: 98989eff63093c9eb4399f0ebad9baa43789ffa5 SHA-256: 4d28be759bcac559dd68d07091630fee3bbbe8c8aaffdbb0989d99b137151427
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one pointing to 'resalured.ru' and a heuristic identifying it as a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to printer ink, suggesting a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=hp+photosmart+d110a+ink PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501383/normal_60143790205b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_6035e5b86bd8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_5fdbbe348fb2a.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/roadmaster_vintage_bicycle_serial_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6017ab9b9a923.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/trigonometric_ratios_word_problems_worksheet.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/the_office_uk_series_2_episode_1_script.pdfIn PDF document text
    • http://sibasijiv.22web.org/30644632977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421342/normal_600630eaaf57e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_604476b94108a.pdfIn PDF document text
    • http://lizakoku.22web.org/zaxas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_5fe81e8ca4a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_602cfa56a598f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_5fe7964f5c8ff.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/libro_la_iliada_y_la_odisea_de_homero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_5fd79d07ba123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golukotekitu.epizy.com/juserekapofapalitus.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/vunabut.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/62694165597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b27ce8-f9c0-44fe-832f-22a9da8152fc/nezeda.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/citizenship_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0205564-c2ae-4316-879c-c872863d66a3/safatisowex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51bcab8-4d33-4eb4-acb2-6a24bd4017bd/81951950031.pdfIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/how_to_use_bernat_blanket_ez_yarn.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/56653592939.pdfIn PDF document text
    • http://joziluwegusudu.epizy.com/roland_tb_303_vst.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/61067021261.pdfIn PDF document text
    • http://wewepov.rf.gd/99779200847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86e05fc-e7a9-4ed0-ad3c-3502eafb02f8/what_happened_to_ram_dass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0187ba-5630-45d6-8d93-1f51f247c453/fozibabilinizekojibude.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_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 5388 bytes
SHA-256: 283d3e93de513c6885d7040f13583ce8502dddab6b7ced41971cb4f020c8ea4e
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 10892 bytes
SHA-256: d5608aae4d311143b9e9dd73e8eb68d310737970de202bd6e59a66ecc8d6ff68