Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab40e9369dc483f3…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 15:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02a1797e348abf4d4f160cd0345a90b8 SHA-1: 1485a9d556cf6f63edde8a50600b65e2d9bbb614 SHA-256: ab40e9369dc483f37f4f97a1325ccf7e653bf92e068887cc2648d364eed5d099
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 directs users to a suspicious domain, likely to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to academic formatting, which is a common tactic for phishing documents.

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://lozipotod.ru/123?utm_term=formato+apa+periodico+ejemplo
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/05ffddbc17.pdf
    • https://cdn-cms.f-static.net/uploads/4492278/normal_5fd6494fa8871.pdf
    • http://jedilinosur.mywebcommunity.org/python_add_authorization_header.pdf
    • http://carbackseat.site/mera_gana_baja_de_song_mingkzzjt.pdf
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fd118a3c17d1.pdf
    • http://biggymstoe.com/antony_beevor_the_fall_of_berlin_1945pweg7.pdf
    • http://discount50it.pro/quran_english_transliteration_bookasy07.pdf
    • https://static.s123-cdn-static.com/uploads/4417992/normal_5ffbca00289ab.pdf
    • http://faketikus.22web.org/jp_morgan_securities_plc_annual_report_2016.pdf
    • http://wotaxatumumodok.sportsontheweb.net/polytropic_exponent_vs_isentropic_exponent.pdf
    • http://airet.space/49842299947p5odk.pdf
    • http://soluzixod.66ghz.com/nunuwita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jimarol.myartsonline.com/sigareme.pdf
    • http://tokiwubamiwi.rf.gd/suboparadodazune.pdf
    • http://vogojitipam.epizy.com/busevudepimigovubupotitez.pdf
    • http://vejebuta.rf.gd/41825276983.pdf
    • http://nojimaduxonariz.rf.gd/xekadamujisi.pdf
    • http://najaxumededalo.rf.gd/zefadewafuwuxurovuko.pdf
    • http://mepolubigujume.rf.gd/digaxejifadaziwamuvokuki.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_off0000ea44.bin
fdb3d88c7f66745808033fcbeb1095be71172ea070048007999b37516b358bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 5072 bytes
font_01_sfnt_off0000fb74.bin
fa7bc78c40186614dd09bbaeb0abd15b0ab0ba13a47a84ecb25c835da3691ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 12156 bytes

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