Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db9adb005b50e96…

MALICIOUS

PDF

86.0 KB Created: 2021-03-23 20:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 009402e933c133df338a4d1e441548a8 SHA-1: 1cf13fb31d27685563cbf8ca716b1f180802da97 SHA-256: 5db9adb005b50e96a28de515d63c8cbb8d07622551abea9aa1ce82b79d3a17f7
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to quiz questions, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=what+questions+to+put+in+a+quiz+about+yourself
    • http://sberhome.ru/the_american_idea_by_theodore_white_answers2eqro.pdf
    • http://vykupavto54.ru/what_dream_indicates_pregnancy5vxon.pdf
    • http://reetodo.online/brother_ls_1217_owners_manualjp2k8.pdf
    • https://cdn-cms.f-static.net/uploads/4389603/normal_605413842d3ca.pdf
    • https://cdn-cms.f-static.net/uploads/4422371/normal_601f9e6fd4ff9.pdf
    • https://static.s123-cdn-static.com/uploads/4419849/normal_5ff91be1d9a6d.pdf
    • https://static.s123-cdn-static.com/uploads/4369307/normal_5ff459d27c8ea.pdf
    • https://cdn-cms.f-static.net/uploads/4387821/normal_6042f608ba321.pdf
    • http://pc-remont.website/how_to_clean_hoover_steamvac_spinscrub_brushesnb3rn.pdf
    • https://cdn-cms.f-static.net/uploads/4416150/normal_60598f22c6fe5.pdf
    • http://lnstagramcopyrightmanagement.com/bhagavata_purana_onlineqxpzs.pdf
    • https://cdn-cms.f-static.net/uploads/4365546/normal_6015b64d243cb.pdf
    • https://cdn-cms.f-static.net/uploads/4475204/normal_5fe799a0e2cc0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_b6d9f4eb10dd4b47be287f44d0beaade.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_48b3de388871431eb2313715681d8342.pdf?index=true
    • https://uploads.strikinglycdn.com/files/91262a2c-eb88-4a48-a4cd-2fc3d32cc07c/baridotajebipiwugojigupi.pdf
    • https://uploads.strikinglycdn.com/files/0cfc583b-c36d-470d-ab8f-69d226cc0ec8/nicholas_sparks_newest_book_release.pdf
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_fcc4acc778c7495ab7a15f9ad47bed01.pdf?index=true
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_ef8e8165bd0d49a0aa0e63672c8748fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/89b4ccc0-90e1-4d02-98e0-894554bc8af1/29059697628.pdf
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_dee489bdcb35492e8c79279b271654d3.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_6a2fa436836a4d46b950321a6eebacf9.pdf?index=true
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_41f7f56486094b669563d186e8391428.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010329.bin
e5dbddce887ed93ef99bd9b7f1dac4b2fc1ec681d58b3f2dcb2ab7fe7c5625d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 5304 bytes
font_01_sfnt_off00011540.bin
91deace0b8790a340bfe420bcc3b22c21065172b808371f25d9c6cad1634a1d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 11508 bytes
font_02_sfnt_off00013ba8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA8 4324 bytes

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