Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba139a84edf5e64…

MALICIOUS

PDF

76.7 KB Created: 2021-04-01 19:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54b27fe1112375fa1dab07f883685b1c SHA-1: d26dd757459405a85ae6f3fb3bd1ed7839aa4593 SHA-256: aba139a84edf5e64931d31c6930031c76162861368d5a6b8bcf850fe789b19c1
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that appears to be a lure for downloading software, which is a common phishing tactic. The document body, though heavily obfuscated, contains references to software and dates, reinforcing the lure. No scripts were extracted, but the presence of external URIs and the ML/ClamAV detections strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=logiciel+gratuit+pour+fusionner+plusieurs+pdf
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd64782c66e1.pdf
    • https://static.s123-cdn-static.com/uploads/4377909/normal_5fcc990dacb81.pdf
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5ffa004abace9.pdf
    • http://bezigex.iblogger.org/krishna_bhagwan_bhajan_video.pdf
    • http://forpost-electrica.ru/gazabedokaluxunaganubui0h7s.pdf
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fea1d8322222.pdf
    • http://usersonlineguardingsettings.site/gajifowesibumodolepif72v2.pdf
    • http://nature-ital.space/family_definition_sociologyh9r6h.pdf
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fd0d397ea889.pdf
    • https://static.s123-cdn-static.com/uploads/4483854/normal_5ff93a73d82b8.pdf
    • http://wonamesavap.iblogger.org/stock_certificate_template_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2172aa7b-56d6-4bcb-a12f-aafeda7c7725.filesusr.com/ugd/0d9129_d63942e5da924c9d8da2c407378632e2.pdf?index=true
    • http://fipamopiwip.epizy.com/42479707889.pdf
    • http://wajalapivibobi.epizy.com/adding_mixed_numbers_worksheet_super_teacher.pdf
    • http://duvugagaxanawag.rf.gd/periodontitis_agresif_adalah.pdf
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_df9d15ec2583416dbea968fcc1248add.pdf?index=true
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_e584a7ce979c4e0ab67558ed936495ed.pdf?index=true
    • http://pejasevolebik.rf.gd/43531359034.pdf
    • http://nisuzadusidu.epizy.com/avery_address_labels_template_18160.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_off0000ec97.bin
5a338b6bb659704f3c79c53fc18b05fb5c8605a2e2d288607d150a025947476e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 5264 bytes
font_01_sfnt_off0000fe99.bin
77fcdc093c617ae8eb67c437784fd94811ce9b4c3f30ccb247a9b3892ed90a6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 11784 bytes