Malicious PDF — malware analysis report

Static analysis result for SHA-256 7672be1673162af1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 07:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e549d79fd9b9fe64db97c7e5e81a7319 SHA-1: d67828ac67fd5fd6c9e3ef44d76244423d24fe35 SHA-256: 7672be1673162af157421e8c1b457f9f5a621a0dfdad756f6c21673a609e677b
104 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that appears to be a lure for academic answers, likely intended to trick the user into downloading a secondary malicious payload. The presence of a 'download button' heuristic further supports this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=wileyplus+chapter+6+answers
    • http://serodot.iblogger.org/12648335834.pdf
    • https://static.s123-cdn-static.com/uploads/4366397/normal_5fdf6e061efce.pdf
    • https://static.s123-cdn-static.com/uploads/4407747/normal_6005559d9799e.pdf
    • https://static.s123-cdn-static.com/uploads/4409616/normal_6008f433200c7.pdf
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fdc217ae1b09.pdf
    • https://cdn-cms.f-static.net/uploads/4483870/normal_5fd9e844ce5b0.pdf
    • http://dukepiweg.iblogger.org/8827379597.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/devuxuzejozam/90307673662.pdf
    • https://s3.amazonaws.com/tipikaxe/wrong_answer_google_traduction.pdf
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_b01f1bdef740467b8230d661998bc30d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b4bf289f-f8b5-4cad-a191-2d2960aa79b1/97181752283.pdf
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_85fa69456277485d9628c7d646342f6c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b730f9e8-1297-4bbb-a2a0-34f7db63da01/dogoromuziw.pdf
    • https://uploads.strikinglycdn.com/files/d80d3daa-a72a-4bb8-a8c0-b7bb45f0f4cd/xutazagor.pdf
    • http://pawajoxonebozew.rf.gd/what_the_bible_says_about_time_of_death.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_22f78ff0448a428ab388d9d4fc04d6f3.pdf?index=true
    • https://s3.amazonaws.com/dotivaf/loctite_super_glue_power_flex_data_sheet.pdf
    • https://s3.amazonaws.com/wolina/grade_3_mcgraw_hill_wonders_3rd_grade.pdf
    • https://uploads.strikinglycdn.com/files/aec850ae-ffce-407b-86e9-01288f9d7e99/zosenoritejuxutafi.pdf
    • http://rikirusekufipu.epizy.com/zelonirevokolaxufaroveru.pdf
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_6c114bf3a5354b35aa0835d4fdda585f.pdf?index=true
    • http://sepazebop.rf.gd/duralast_bp-dl750_manual.pdf
    • https://s3.amazonaws.com/bewibiwat/52883133902.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_off0000e3fa.bin
be8d906645d6638ca4f770a1f8171b26ec90441090f6186b603e9defa98ab677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 5384 bytes
font_01_sfnt_off0000f65e.bin
54531ab8d1e631e89ed0c2aa4ecdbca884ea7c053e0b2eca5b9a73d0da0fe279		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 13944 bytes

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