Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21c7cbcf746e1ad…

MALICIOUS

PDF

82.7 KB Created: 2021-01-04 01:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f8965056d58656fcfe8982253060eb33 SHA-1: a1dcbedf108fbf8299963caefe049bdcc3f5d429 SHA-256: e21c7cbcf746e1adacc213eef358d50ad5a3d2ab3980c8aeb1510b9db147134c
104 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to a suspicious domain, likely intended for phishing or malware distribution. The heuristic 'SE_DOWNLOAD_BUTTON' suggests a lure to trick the user into downloading content, which is consistent with the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffi.ru/aws?utm_term=conjunctions+worksheet+3rd+grade+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fd6449f989e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416149/normal_5fdfc74f04365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5f9931fba43bc.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/icFhijc/red_ball_3_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f89f316bffd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428078/normal_5fc6bdd36fe29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5fe6258dc2638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5faa21b25ebbe.pdfIn PDF document text
    • https://cdn.sqhk.co/vovidonob/zijhh99/28855783274.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c2676e-0ae4-4e59-a893-ed9c520239c0/hey_quiz_answers_video_game_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e38b198-16fd-4dfa-8d9a-3925bf43a81b/gawakizoxedesibuwodiw.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 6632 bytes
SHA-256: 29a5d78dfb67a44ee01f037407103e155f37453f9f6d94be8c56bcb3e73f0967
font_01_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_02_sfnt_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 5688 bytes
SHA-256: 8c71937724324e4de1d89faf2f68d055d3d2c55ae9c724588faa7abe61fa00af
font_03_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 13512 bytes
SHA-256: 7900c94d438e5fec62caa45bd5255ea092207a3e005c4aff08d26abc37130e16
font_04_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 16564 bytes
SHA-256: e9fde5e59fa7c827e91d6001a42c46ff55e181290b4c6f0de258572d9fc6dc4c

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