Malicious PDF — malware analysis report

Static analysis result for SHA-256 9162c0844a4990a7…

MALICIOUS

PDF

69.5 KB Created: 2021-06-13 02:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cb36d943620722c8a27e038e7bf0ecbf SHA-1: 551b002218b7b61fca79d25bc44eeb173b7865d5 SHA-256: 9162c0844a4990a7584de48495378bfc20330851241dc752ee94a9dd38e0610a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains multiple embedded URLs, with one pointing to 'chcial.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Reproduction in plants worksheet answers'. No scripts were extracted, but the presence of external links and the detection signatures point towards a phishing or malicious content delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/pbw?utm_term=reproduction+in+plants+worksheet+answers PDF link annotation
    • https://dejizova.weebly.com/uploads/1/3/3/9/133986792/0a482.pdfIn PDF document text
    • https://pidorisegis.weebly.com/uploads/1/3/4/7/134761928/62375864df14b11.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/zijod_pufozufelu_jafabidutipalat.pdfIn PDF document text
    • https://romidanunopupef.weebly.com/uploads/1/3/1/1/131163616/fiduwezititisiwane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0c81cd-b721-4f4b-9cee-a04938a65541/how_to_enable_epic_games_and_fortnite_2fa_two-factor_authentication_-_epic_games_support.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e740461d-e975-45ff-bcd8-7c02244553cc/how_to_put_music_on_ipod_nano_6th_generation_without_itunes.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144631866/kufelisesib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0cd05c-5049-4daa-ae22-345606a453df/jijekozapofewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab52007-7191-44e5-841b-1e4a362d5c62/download_psiphon_pro.apk_155_mod_full_unlimited_server.pdfIn PDF document text
    • http://zezupagijene.pbworks.com/f/wakejedovisolil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dae02d8-2234-4672-bfa5-2f81a934df29/2193144497.pdfIn PDF document text
    • http://kegujomojos.pbworks.com/w/file/fetch/144830685/planisferio_con_nombres_y_division_politica_para_imprimir_tamao_carta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6624d85-5df8-4c5c-bbe9-b14e7819deae/angelcare_baby_bath_reviews.pdfIn PDF document text
    • http://tevimunon.pbworks.com/w/file/fetch/144721149/4_stages_of_cognitive_development_quizlet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 5324 bytes
SHA-256: d7d0217d1ae980f40721549d3d84fb8157473f0846400fc22294295203e06321
font_01_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 10340 bytes
SHA-256: 538dfeb1db3fe1334f0c2b3ac12799b19155e253c1c705786a4448d7575d7e3b

Open this report in the interactive analyzer, or submit your own file for analysis.