Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c231b99ba66704…

MALICIOUS

PDF

112.4 KB Created: 2021-03-18 17:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8dcc254d7ca1050f7f07eb652f6eb61 SHA-1: d4b777ad1fd16a21fcb36e06d3e06b4932a9d011 SHA-256: 21c231b99ba6670469cb3d51995b492e0c70abc81f3c95e5f847a5554c800ada
136 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. The embedded URL, https://mezovuduw.ru/strik?utm_term=a+series+of+unfortunate+events+books, is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://mezovuduw.ru/strik?utm_term=a+series+of+unfortunate+events+books
    • https://cdn.sqhk.co/zifakepavax/FjfL5wk/tovuk.pdf
    • https://cdn.sqhk.co/pujixefan/qxiaR66/60432787779.pdf
    • http://helpforteam.com/download_48_laws_of_power_audiobook_freea2d6e.pdf
    • https://cdn.sqhk.co/tukutabu/hfjdGZx/rockstar_full_movie_720p_filmywap.pdf
    • http://help-ruleviolation.com/tofedea2h8f.pdf
    • http://rotixumuzu.22web.org/45124087996.pdf
    • http://bewepovuzif.iblogger.org/33791089348.pdf
    • https://cdn-cms.f-static.net/uploads/4415770/normal_603e4fc5e834c.pdf
    • https://cdn-cms.f-static.net/uploads/4382631/normal_6013b48ac3d8e.pdf
    • https://cdn.sqhk.co/zojixemem/esjkhbQ/4971064501.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xatabiraluxuded.rf.gd/iphone_x_gestures_guide.pdf
    • http://pubopebiwofaz.epizy.com/77262383821.pdf
    • https://uploads.strikinglycdn.com/files/36f0f51f-2f15-4f05-b8a7-9031557eed58/collar_x_malice_unlimited_adonis_route_walkthrough.pdf
    • http://kufuravolej.rf.gd/marwadi_bhajan_video_mp4.pdf
    • http://ramimivojis.rf.gd/wofabujizinoguj.pdf
    • https://uploads.strikinglycdn.com/files/04b879af-39b3-46ab-94bb-a8730dad335c/93506310508.pdf
    • http://jugofave.rf.gd/gusolidovubasir.pdf
    • http://furugavasipif.epizy.com/winozawoso.pdf
    • https://uploads.strikinglycdn.com/files/2f719bb2-40e4-4fbe-bcd8-845b6d0e707a/anatomy_of_story_reddit.pdf
    • http://losisotudek.epizy.com/34223361369.pdf
    • http://gofofeset.rf.gd/wasesugawupaxutovu.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_off00017bb9.bin
ec6527f05e68529b9247652e8bdf4ea02f014a7455da922008a639a061601a56
pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB9 4980 bytes
font_01_sfnt_off00018cc4.bin
20b45b253f1827606f314ff22afce52db30d455ebdcb5b5f23f90a76c6a4fa1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC4 11716 bytes