Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf58da415a0cfc4…

MALICIOUS

PDF

67.0 KB Created: 2021-03-31 15:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bd879638f8db43c5821a949a233eb0c SHA-1: bc460a0440634a0331490ff414d060bff30438a9 SHA-256: 3cf58da415a0cfc48a23a0f6fafeb3bf3bb4c71cc77855b209504fc064a455fa
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature, flagging it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a technical document, likely intended to trick users into visiting the malicious URL.

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://xezojetit.ru/award?keyword=aashto+lrfd+2020+espa%25C3%25B1ol+pdf
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/fivumatirafudujalez.pdf
    • http://help-igcopyright.xyz/3__slots_slots_slotsp4pjz.pdf
    • https://lifusapemar.weebly.com/uploads/1/3/4/5/134526201/5111b.pdf
    • http://metinozub.iblogger.org/87081754023.pdf
    • http://wirelessinfo.ru/15958287259rxkc.pdf
    • http://naturagrush.space/399508586718zzxe.pdf
    • http://ipoteka.net/learn_calligraphy_free_worksheetsm9724.pdf
    • https://mizovitima.weebly.com/uploads/1/3/4/2/134266674/dawuliruvux.pdf
    • https://dililoperajat.weebly.com/uploads/1/3/4/6/134631443/69e84995.pdf
    • https://radamokugek.weebly.com/uploads/1/3/2/6/132696621/wunukatigebuwewerate.pdf
    • http://pitushok.fun/nusosavofatarifativijofesxtt6p.pdf
    • http://zdorovienashevse.xyz/telecharger_music_gratuitement_mp33gugk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bepukuba/diagrama_de_fases_del_acero_1045.pdf
    • https://s3.amazonaws.com/xojafemori/fefevowilibujerirubis.pdf
    • http://nizamazibenu.rf.gd/how_to_fix_my_water_dispenser.pdf
    • https://uploads.strikinglycdn.com/files/80e2595b-5ae7-4cdb-9f61-275faca667a6/the_one_thing_gary_keller_free_download.pdf
    • https://uploads.strikinglycdn.com/files/4be81d9d-d229-4ee0-8dd4-6d655c375e61/fapojarivarawabo.pdf
    • https://uploads.strikinglycdn.com/files/03871ed8-abdc-4d01-a68f-635cd7e5e05e/quiz_logo_game_answers_level_36.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_off0000c4f6.bin
5f0c539b31d4cd2742086bc0e212e80445e15783e7bc344138ab1e94c66dec70
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 5604 bytes
font_01_sfnt_off0000d7ba.bin
11fcdf1ff679d59f495af46d74f467340c0a40d76b6626e6c5c0fff392017db9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 11296 bytes