Malicious PDF — malware analysis report

Static analysis result for SHA-256 6641bd1064cf4ce6…

MALICIOUS

PDF

86.0 KB Created: 2021-02-15 13:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2ab696b5310f986ecd30261fad12e25 SHA-1: cb63a5629731c11ddcf640a0b85267eff32f6d3b SHA-256: 6641bd1064cf4ce6803f6ba7898a4ba7b15119abb773a99609ee46d88cf9e94d
96 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The embedded URL, 'https://jottigo.ru/strik?utm_term=traductor+de+espa%25C3%25B1ol+a+ingles+y+su+pronunciacion', suggests a lure related to translation services, likely to trick users into visiting a malicious site. No scripts were extracted, but the PDF structure and external URI heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=traductor+de+espa%25C3%25B1ol+a+ingles+y+su+pronunciacion
    • http://mnclassis.org/bahubali_1_movie_songs_telugu948nw.pdf
    • http://semengergel.ru/98078988481dbooc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://maxonelotod.epizy.com/bumiwosagiwuxomosasi.pdf
    • https://s3.amazonaws.com/kufazete/dubebosoraxarite.pdf
    • https://s3.amazonaws.com/jufowokedunod/worewati.pdf
    • http://nupadamemal.epizy.com/lopuxaxakabamimolojulidid.pdf
    • http://zosajirigo.rf.gd/zotoxujurudada.pdf
    • https://s3.amazonaws.com/kuboki/60912578801.pdf
    • https://s3.amazonaws.com/wupuxus/24785904778.pdf
    • http://gamukudolaxe.epizy.com/lab_8_population_genetics_and_evolution.pdf
    • https://s3.amazonaws.com/tobovunoberiki/46088852891.pdf
    • http://lezabiwobefek.rf.gd/ascending_order_in_sqlite_android.pdf
    • http://napupitupevis.rf.gd/6._3_aquatic_ecosystems_worksheet_answers.pdf
    • https://s3.amazonaws.com/fifuto/88603561163.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_off00010ff8.bin
0334c445c062371486ad35eb232b83cd4760913561b3b859cb52280f17ec2857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 5504 bytes
font_01_sfnt_off0001227f.bin
f413dce28948b64c64979f9836389f20622870f561affe0704fd147499c0f4a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 11632 bytes

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