Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbbfcedf5e089aa…

MALICIOUS

PDF

91.1 KB Created: 2021-03-21 11:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96278378299bd3d7ae4acfa5a76bddc6 SHA-1: 7983bddc56da44c332d439e2c5342ccf671b923c SHA-256: efbbfcedf5e089aa19213e09d8bdd2855e6014a069ef4b5fa7b358453b6691c5
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'bologen.ru', which is likely a phishing site designed to trick users into downloading further malicious content or providing sensitive information. The document body, though heavily obfuscated, suggests a lure related to 'workbook answers'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/wix?keyword=unidad+1+etapa+3+workbook+answers
    • https://zilibadokaji.weebly.com/uploads/1/3/2/6/132680781/f7e600f1ccf2f.pdf
    • http://wekeb.space/maths_no_problem_worksheets_year_1di0ok.pdf
    • https://cdn-cms.f-static.net/uploads/4452398/normal_60504ff4e39a1.pdf
    • https://static.s123-cdn-static.com/uploads/4366004/normal_6003b171c7cf5.pdf
    • https://cdn-cms.f-static.net/uploads/4444866/normal_6045494e2ea6f.pdf
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/a8f9904b43e5.pdf
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/4948323.pdf
    • http://copyrightproblem.com/jiwipegezebovabajewobomysmpy.pdf
    • https://lumewogomor.weebly.com/uploads/1/3/4/3/134319436/zotutogananiwewak.pdf
    • http://hopecommunitynaz.com/3_formal_greetings_in_spanishv1e52.pdf
    • http://centerbluebadge.com/space_maintainer_indicationsia7wl.pdf
    • https://puwijupuf.weebly.com/uploads/1/3/4/7/134701632/vekidefu.pdf
    • https://cdn-cms.f-static.net/uploads/4488141/normal_60469a6710da0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zaxefemebidaz/62560285328.pdf
    • https://uploads.strikinglycdn.com/files/cb306be1-c7c1-46d4-8806-cf4b71497b0f/descargar_el_jardin_secreto_libro_editorial_zig-zag.pdf
    • https://uploads.strikinglycdn.com/files/8a9ca539-8912-4154-aa4b-c82bb659c674/78583723598.pdf
    • https://s3.amazonaws.com/najipavez/bhagavad_gita_verses_in_sanskrit.pdf
    • https://uploads.strikinglycdn.com/files/4e7d32b3-d3e1-4d3c-8495-205cc98f544a/catholic_prayer_book_download.pdf
    • http://zezorug.rf.gd/94540870222.pdf
    • http://xunepesefosog.rf.gd/video_from_facebook_to_computer.pdf
    • https://s3.amazonaws.com/xulikamul/bavedobere.pdf
    • http://nuvavevuk.rf.gd/lirutex.pdf
    • http://losexexed.epizy.com/sesugananotulevojezufod.pdf
    • https://uploads.strikinglycdn.com/files/89df81a0-edeb-4678-a3c4-28731f1f24b5/sony_str-dn850_price.pdf
    • http://ratimoli.epizy.com/linear_programming_worksheets_with_solutions.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_off000120ee.bin
e593f22086724069c817373644dc0c95ece799bbbf28bacc9418e3332fff3647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 5424 bytes
font_01_sfnt_off00013388.bin
5bdd2985cc2dcbe427e4057519eb6ad7acb37494ee0aa8449b42e2fd534ca2c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 13264 bytes

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