Malicious PDF — malware analysis report

Static analysis result for SHA-256 682e724fc3e6f927…

MALICIOUS

PDF

84.1 KB Created: 2020-12-20 00:30:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed6ac888046e1551cc010be882f60393 SHA-1: 942679bba33e45bedc220225b270e1e114d21cb5 SHA-256: 682e724fc3e6f92737357652a577eb733f53a5d3a83a4cdf3975e45136cae884
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it embeds external URIs and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains text related to an "ecology unit study guide quizlet" and the authoring application "wkhtmltopdf", suggesting a lure. The primary malicious IOC is the URL `https://trafffi.ru/strik?utm_term=ecology+unit+study+guide+quizlet`, which is likely used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/strik?utm_term=ecology+unit+study+guide+quizlet PDF link annotation
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/nogafiwonigumi.pdfIn PDF document text
    • https://lolijigi.weebly.com/uploads/1/3/4/7/134700793/xewezewiji_pabugijutazuvi_tujazat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_5fc174b57ecdc.pdfIn PDF document text
    • https://mesenogixu.weebly.com/uploads/1/3/4/7/134736765/3394383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_5f9c59dd64326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5fbcb643b533b.pdfIn PDF document text
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/lipunejugoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2ed17e7202640ea1bf0/t/5fc32bfd6457125654a3ec37/1606626302350/wedding_dress_with_cape_attached.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11355ab79f442f22aa123/t/5fc2c448f81c9a2a0cfd88fb/1606599753500/root_kingo_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7dc3dfdd95b60d4c91c/t/5fcfbfda8639e47cbc0e5abc/1607450587483/fitbit_charge_3_screen_black_and_white.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/edtpa_lesson_plan_template_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/resmed_cpap_s6_user_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 5036 bytes
SHA-256: f9d576f814949a3f664259000c5f457e22d00fe3a4f2915f94a3cb31bda2227d
font_02_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 11524 bytes
SHA-256: 2b20277a3f30ed9e3bfc970773450a9d354e3bded5df5c1b8551ebdd904b44d4

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