Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cc282fab3cbc09…

MALICIOUS

PDF

71.1 KB Created: 2021-06-01 03:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56639135d880b474bb49c6c22dca51fc SHA-1: 7cdcc8b0046fa6cfa7ab2de59fab105dd78fb4ff SHA-256: 38cc282fab3cbc098e8125f8803eec9efa57c2f8a244dd687285c2382f28181e
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL pointing to 'chcial.ru', which is likely part of the phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/pbw?utm_term=plantilla+prisma+pentagonal+para+imprimir
    • https://static.s123-cdn-static.com/uploads/4499651/normal_5fcd965132229.pdf
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fdff241802da.pdf
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5ff49adb65df6.pdf
    • https://cdn-cms.f-static.net/uploads/4380674/normal_6037d08e84023.pdf
    • https://static.s123-cdn-static.com/uploads/4385206/normal_5ff9d4fd340ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/41a70cef-0c7f-4492-b05d-c0c1717cb691/42788724252.pdf
    • https://uploads.strikinglycdn.com/files/a51805bc-8db6-45fd-bf69-ddf76ae5baa7/nancy_drew_games_free_download_full_version_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/a9a428b4-e29b-4aff-ba24-1e7d465edd62/kinetic_and_potential_energy_worksheet_answer_key_physical_science.pdf
    • https://uploads.strikinglycdn.com/files/96c11899-1fa3-457a-9724-52a15b2e7c59/27746333604.pdf
    • https://uploads.strikinglycdn.com/files/f407cbd9-12b8-4337-824c-e10c80e75287/glencoe_chemistry_matter_and_change_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/948beea2-4bf5-4e6e-abf6-90422bedf04c/58243381407.pdf
    • https://uploads.strikinglycdn.com/files/1b20eca2-04ef-47b5-8cc2-a01150683765/interview_questions_for_call_center_quality_analyst.pdf
    • https://uploads.strikinglycdn.com/files/a4115a43-8315-4da2-996d-6eeb7c2b331b/lesulaguzopofiduvadapelud.pdf
    • https://uploads.strikinglycdn.com/files/8fbb330a-1864-4a69-9909-f6369d721574/what_are_the_best_vegetarian_cookbooks.pdf
    • https://uploads.strikinglycdn.com/files/12bd6b27-dba7-43c4-a4b5-49df63bfda8b/4064982185.pdf
    • https://uploads.strikinglycdn.com/files/6c57ac38-22ba-45c2-a409-689c456c7e09/17307935208.pdf
    • https://uploads.strikinglycdn.com/files/d316a37c-3a5a-4d77-b6f0-7f5f4dd726a8/cloud_computing_for_dummies_review.pdf
    • https://uploads.strikinglycdn.com/files/bb4f31a4-7ba9-4d50-9610-b2509dc672c2/janutulibisokiwidav.pdf
    • https://uploads.strikinglycdn.com/files/ea01310e-0e90-4747-b439-be3de90a6482/army_field_sanitation_training_course.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d604.bin
5d59a3102297e0997990797f8052bc78bfce2759fbc0db7ab090c5da25ced789		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 5140 bytes
font_01_sfnt_off0000e769.bin
9dfddf2b3631322f013f61dcc9266746c8d40d716f18a187e86c7d0a041d339d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 11748 bytes

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