Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b4890a43932f5e…

MALICIOUS

PDF

97.9 KB Created: 2021-03-25 20:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3456bb12374b7eed9b879630219d8459 SHA-1: b22cca6124b18065de7e91a4300a4b275fda7963 SHA-256: 70b4890a43932f5e7f7bac7f719b85ca9937f08549c5e355cbcf08836dcfa418
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains text fragments related to 'Paulo Coelho books list' and 'wkhtmltopdf', suggesting a lure to a malicious site for potential credential harvesting or further payload delivery. No scripts were extracted, but the presence of multiple external URIs points to a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=paulo+coelho+books+list PDF link annotation
    • http://nubemeketetu.mypressonline.com/gimajibaragebexitatiwop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_6041e8963080f.pdfIn PDF document text
    • http://dexuposi.sportsontheweb.net/a_first_course_in_graph_theory_solution_manual.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/81365637323.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/9307529555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_603103c6b337a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5ff54da175d3e.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/91337685133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422150/normal_605bfa7814d5d.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/panurolin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_60258b598533a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_1bfdf5a53fbd4bf3aa03d847c780497c.pdf?index=trueIn PDF document text
    • http://binuwuzipu.myartsonline.com/what_is_categorical_data.pdfIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_3b9c0f3e7a0d4782b81f7f238cd3cfbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60a33da-2cd3-4b6f-9209-41feabcff33b/best_solvent_for_recrystallization_of_benzoic_acid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74dc6aba-e21f-459f-8ac1-ffb5119479a2/xowanetigofisarepufovi.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/17970262355.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/pendidikan_agama_islam_kelas_12.pdfIn PDF document text
    • http://vegubom.atwebpages.com/70270381454.pdfIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_5146da25b8744f5c91e5af2122f75cef.pdf?index=trueIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/61213014812.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/how_do_you_program_a_universal_remote_to_a_jvc_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/zurubanesenedotuwipag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c9eee1-cc9d-4688-81d4-64762fb8b97d/how_to_reset_haier_ac_wifi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 4772 bytes
SHA-256: 137554ebbd98c13001cb8cec93a54eaa183ff9c2223c4e67908a413ef16178dc
font_01_sfnt_off00014402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14402 11472 bytes
SHA-256: 459f3629bd33838cf081a305d58e9581ace192b169fb36cff873a62281e4222f
font_02_sfnt_off00016a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A45 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361