Malicious PDF — malware analysis report

Static analysis result for SHA-256 628036ff88e6a9c3…

MALICIOUS

PDF

72.0 KB Created: 2021-04-25 04:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8fdf0880d5ba8830d656c0c564f5347 SHA-1: e15f6b3737b652b00a7704c43065976403eea739 SHA-256: 628036ff88e6a9c3154b9e0dd721f913840569d5c0eb855bc1bd32ef89985b8b
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=place+value+numbers+to+1000+worksheets
    • http://sezejawi.mypressonline.com/52353318615.pdf
    • https://cdn.sqhk.co/libuzewis/DKLigig/jerewumitexanenoviroje.pdf
    • https://static.s123-cdn-static.com/uploads/4443804/normal_5fdc973bceb2a.pdf
    • https://cdn.sqhk.co/naxusepimosa/kopidqX/2048_unblocked_hacked.pdf
    • https://cdn.sqhk.co/norifasil/fQ0ijl6/homicide_squad_new_york_cases_walkthrough.pdf
    • http://noroxutapokuz.iblogger.org/cibi_e_bevande_in_inglese.pdf
    • http://tojuvapemupo.mywebcommunity.org/juwerefonefunediwu.pdf
    • https://cdn-cms.f-static.net/uploads/4457839/normal_602b494e21daf.pdf
    • https://cdn-cms.f-static.net/uploads/4467955/normal_601ad2d3878b8.pdf
    • http://gewututikame.getenjoyment.net/carbonate_reservoir_characterization_jerry_lucia.pdf
    • https://static.s123-cdn-static.com/uploads/4370533/normal_5fe184fecca89.pdf
    • https://cdn-cms.f-static.net/uploads/4412996/normal_604342ee8319a.pdf
    • http://gekodejevotug.medianewsonline.com/how_to_make_an_interior_design_layout.pdf
    • https://cdn-cms.f-static.net/uploads/4481988/normal_605a73b93c495.pdf
    • https://cdn.sqhk.co/nesadatifu/wKdjeRJ/44496779986.pdf
    • https://cdn.sqhk.co/gutifusuf/ggdingi/72947932144.pdf
    • https://static.s123-cdn-static.com/uploads/4365634/normal_5fe270621d80d.pdf
    • https://cdn-cms.f-static.net/uploads/4455396/normal_6033a17dc4db7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/940d6361-f69a-48d8-be44-8a287a7966d6/28250334101.pdf
    • http://wenares.myartsonline.com/56950087083.pdf
    • https://uploads.strikinglycdn.com/files/31d5a10e-3a3d-4268-8e8b-c41ac6d83b2d/51223979769.pdf
    • http://tifilumiteva.epizy.com/catalogo_avon_campaa_18_2019.pdf
    • http://wamowif.rf.gd/al_amyloidosis_guidelines.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_off0000db2c.bin
a7bee574f3737649f43bc1055b273c384328c5a43139dec5710c9e21cbc6cdda
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 5588 bytes
font_01_sfnt_off0000ee1d.bin
79fe508eeee2455d34163b9eab0b0e77572924218911369d92033edf9ebcd091
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 10708 bytes