Malicious PDF — malware analysis report

Static analysis result for SHA-256 1852321cd53486c0…

MALICIOUS

PDF

80.6 KB Created: 2021-04-08 09:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dfebe62362ff51b6e18f138e9ba0930 SHA-1: 95436b2a92464e699fc048bdf63b25169308aabb SHA-256: 1852321cd53486c00b08c3bd67e5f5f2fdca4b6f59c4d18d60bf7ee79f99a5bc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. It contains an external URI pointing to a suspicious domain, likely intended to deliver a secondary payload. The presence of a visual download lure further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=booster+amplifier+pdf
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5ff9cd07b8bd3.pdf
    • https://cdn-cms.f-static.net/uploads/4388598/normal_6015090c2a433.pdf
    • http://kinemulawaw.sportsontheweb.net/sword_art_online_alicization_lycoris_update_1.11.pdf
    • https://cdn-cms.f-static.net/uploads/4417405/normal_602d801656139.pdf
    • http://pawusewi.sportsontheweb.net/budget_2020_sri_lanka_highlights.pdf
    • http://lapitubemexidi.mywebcommunity.org/73464085045.pdf
    • https://cdn-cms.f-static.net/uploads/4414869/normal_60366c49ba715.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_3b63de02220f47bc8f007556f711c519.pdf?index=true
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_16c48e039bca431cbdfc0bf7a484cd72.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a831080-1a97-4a9e-9b8f-062fc1f3780e/56088943094.pdf
    • https://s3.amazonaws.com/napejaxosinages/bhojpuri_chhath_geet_hd_video.pdf
    • https://uploads.strikinglycdn.com/files/f113bce6-b36f-4e58-b05c-c7568f738fe4/57555278109.pdf
    • https://uploads.strikinglycdn.com/files/ef6b62d9-63c8-45f6-9764-917fa2cee4c9/nimanefuvebuvinobusaxudop.pdf
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_6f01b8a761ed4e62905f3514c1c5c47a.pdf?index=true
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_0bd294322b9340689f41345b5686e4df.pdf?index=true
    • https://uploads.strikinglycdn.com/files/30a7f5db-0506-4bb1-a7bc-0ab2d3ed9bee/56168308206.pdf
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_7438137c2f0f4c2c9b4ee919ee575296.pdf?index=true
    • http://gumomexad.onlinewebshop.net/dainik_assam_newspaper_download.pdf
    • https://s3.amazonaws.com/liwafo/solving_algebraic_fraction_equations_worksheets.pdf
    • https://s3.amazonaws.com/mizeteb/dupowalejirike.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_off0000fd34.bin
fd1230a1e94ec3aa822c6935c76ab17f4491f684b769bcea1db036f68b111a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 5236 bytes
font_01_sfnt_off00010eec.bin
8f927e589fc60918ca21205f2815a985fb6a707e963c8d81c585142ac2a2ed1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 11320 bytes

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