Malicious PDF — malware analysis report

Static analysis result for SHA-256 21566437b879c723…

MALICIOUS

PDF

85.5 KB Created: 2021-02-14 10:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e8e5f0e112f9c44ba533c73d731e3eec SHA-1: fe5347a23438e4d43068fc3b4564542b646bdd2c SHA-256: 21566437b879c723700279b5956b46d46084105982dd885f7f8cc30a1f821daf
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to 'the story of x' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=the+story+of+x+summary PDF link annotation
    • http://gamedv.design/kitizibenuv62qd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_5fd1204f4e093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_6013bd120aaac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_60250ae5e429f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_600ef0088f69d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_601b3e19e2d09.pdfIn PDF document text
    • http://stepka2016.xyz/2674831292047r02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500208/normal_5ffba36e709bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/diet_coke_and_mentos_experiment_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/pasogatafojelapepixod.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/tarot_minor_arcana_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/nigodokobunivapo.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/alien_shooter_hack_apk_for_android.pdfIn PDF document text
    • http://najiniroxow.rf.gd/25114387030.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/castrol_edge_fst_5w-_30_ll.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/xelemorezilugudizum.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/adenomas_hipofisarios_no_funcionales.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/bollywood_movies_hd_free_sites.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 6444 bytes
SHA-256: d22cac10f319a008d3a3a07023c4d76637f032ea38873d2387d8d1eced661efe
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 5096 bytes
SHA-256: 196872a8411845f2ad4f083ca3b59c9f34adeccdc532d238263ee916b4ef8a10
font_02_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 10960 bytes
SHA-256: bc4dc335926e44c803a8bc7ccc0a34948d118385d78341e7d819852e9a1d1fe5
font_03_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 6180 bytes
SHA-256: 2131635090ccb9e0b7310b9f018479179b6a7a5663454b0bcca6440e0eb56cdf

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