Malicious PDF — malware analysis report

Static analysis result for SHA-256 435e4aa69e52be59…

MALICIOUS

PDF

76.1 KB Created: 2020-12-29 16:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1c647d1ee875c0537efce77b16ff255c SHA-1: 4ca7789882129b816e94245be5bdbe8418fd3b36 SHA-256: 435e4aa69e52be594ac0c4496d2cfcf95334063260be03bd7ae8ea05035269d8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and a machine learning classifier. The document body, though heavily obfuscated, suggests a lure related to 'origami flower bouquet instructions' to entice users to click the malicious link. The presence of embedded URLs and the overall detection by multiple security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=origami+flower+bouquet+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449630/normal_5fe90209ecca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5fa500602049d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/70094173990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e1ea76-cbd2-43e9-9bc8-c7f097897884/44151453326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf2ed9d-cfe4-4de0-80d0-9be11a1738ec/drastic_ds_emulator_download_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e995398e-e6bf-4ff7-a003-fe56b6f6275d/can_ducks_eat_dried_mealworms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fc839f-fd21-426f-9862-e43df4f91fe6/41847751340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c57e1cb-effc-46b6-99e0-0f2cbccbad9f/nipolasatalifezowagafopik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eec54bc-f496-4490-ab64-0623fc4ea4aa/nintendo_snes_controller_switch_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ddbe49-970a-4486-895c-89a5f32ea318/tensorflow_for_machine_intelligence.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/gaxubukadotuzixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15779a6d-944c-477c-8132-66dc9a133511/laranja_mecanica_online_legendado_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d2456b-c2f1-4a72-9dac-972357e5181c/pho_dong_huong_667_monterey_blvd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7d765d-86db-4113-87dd-69509036975a/jexet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f508ba39-1e51-4faf-8b3c-c6eb627e5ee8/jay_goga_dev_action.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d1cc19-68e3-49c4-8f37-c61c801cea43/87005217338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3552445f-c893-489a-893b-501392076885/sitijofepuzokir.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_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 5584 bytes
SHA-256: d14d8fc84e96aa3c51508f95ace1ccc24182c8893064e68d79cee23c460c02f7
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 10628 bytes
SHA-256: ad37f92536c475ffb52b756d93a54d18f5fe999bc1005db2e350eb785a0e1013

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