Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef47d41d318eec3…

MALICIOUS

PDF

72.9 KB Created: 2021-03-04 00:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 59c1a3b2b7176777ae27029353264c3a SHA-1: 4e90e7e10a516108dc23c09a1eeb0394fbdfe21c SHA-256: 1ef47d41d318eec3de9e73d56a6b9841dffef32b826d01dd2bf9fe3f6eb6d88d
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains an external URI pointing to a suspicious domain. The embedded content, though heavily obfuscated, suggests a lure related to 'worksheet answers', likely intended to trick users into visiting the malicious URL. No scripts were extracted, but the PDF structure and URL indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=elements+of+art+and+principles+of+design+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392215/normal_5fc5fcea5c339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_602f8ffe6a9a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500877/normal_5fc6983f400fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fca7116a6d8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389585/normal_60066b45aa90e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_6021792cb5650.pdfIn PDF document text
    • http://vikubemaba.22web.org/berserk_manga_chapter_103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426974/normal_60388b0ac0f94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_5ff5800debc2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://danesanifulen.rf.gd/vscode_format_json.pdfIn PDF document text
    • http://kikodanaso.epizy.com/60710754861.pdfIn PDF document text
    • http://siwupogogu.rf.gd/wolf_wall_oven_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/5142602142.pdfIn PDF document text
    • http://naxokagad.epizy.com/silavuz.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/taredevojaxox.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/mevesimatekusopizidabobif.pdfIn PDF document text
    • http://zobadobu.epizy.com/16759718971.pdfIn PDF document text
    • http://sajufevamofu.epizy.com/beyond_bigger_leaner_stronger_challenge.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 5680 bytes
SHA-256: 00e0a42bf51c1dce39c7df63c40519a2e07259435492efe9049173678ba03010
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 10240 bytes
SHA-256: 4d21e7943fd0ce06b1a855ea06c0a6adc5dee5809b595c44c95234894400d412

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