Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8a3cf100527ab9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-18 05:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1ad54822f1d33e810bd3878cc9474af1 SHA-1: a61f5945809c4f3bec260a8fc02e7fd22de727c6 SHA-256: cd8a3cf100527ab975859c0363d03f84164eb8f484edd9fb83efc0942901bbcd
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://kuzutuzo.ru/123?utm_term=anjathe+tamil+movie++hd PDF link annotation
    • https://pezibife.weebly.com/uploads/1/3/4/3/134376528/sijetogiwiji-ramasogiku-xufoduxojegu.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/76949299845.pdfIn PDF document text
    • https://pipefedib.weebly.com/uploads/1/3/1/3/131383483/basefe.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/83253664658.pdfIn PDF document text
    • https://pipomojum.weebly.com/uploads/1/3/4/4/134437532/7595170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_603d0bd58daf3.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/pufaka.pdfIn PDF document text
    • https://wufikasuruxur.weebly.com/uploads/1/3/1/6/131636700/livazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fdad4fbbf71f.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/silver_eyes_graphic_novel_read_online.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/mawewopovepen.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/how_to_draw_a_person_body_easy_step_by_step.pdfIn PDF document text
    • https://tasitovutad.weebly.com/uploads/1/3/0/9/130969559/jakererakezin-jijodige-vurubozisusig-letijikika.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_bf627c74d5864605a90bde1ad5b196ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ee65d2-e8f8-42f6-a0b6-df12a691876c/what_settings_do_i_use_for_night_photography.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_6265d90d1df74f03815a6a375c94098d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c412df-c766-45f4-8035-9f9cee346856/pugupivaxapokufaxub.pdfIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/craftsman_radial_arm_saw_recall_video.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_d5a87c708687466fb0e397d66419e274.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ecf4a8-1126-4da8-8026-58f22345ab80/song_of_swords.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_6f74d645092f407fa55ed8395033cd95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c17d58-16f3-4ee9-b315-3b14bca591e1/54935054228.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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 4916 bytes
SHA-256: 467eb2be0fd7bd789641fb2a8d97cfe4506e22f8ffe0c5be7b5d5b6f366b453a
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 3256 bytes
SHA-256: 7d9ca3bcf80773e1f5a29222ea74f8ee4c44eca7aaac127a269311d1eb348e67
font_02_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 10220 bytes
SHA-256: e3327ec4f309b5ad5eb6765f4e8446a207f4e7cdc8a7cb38290c062ca1f0fff0

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