Malicious PDF — malware analysis report

Static analysis result for SHA-256 444d3efa5360eeea…

MALICIOUS

PDF

83.7 KB Created: 2021-03-04 21:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2fa17de2ed60ca6b6883f0b5a9d9330 SHA-1: 0865ae49077b1626aff4aae493d24f63abcf3eb8 SHA-256: 444d3efa5360eeea1bad227f2cdced85a5f780da4cf72e678b1dc6470eb43eb0
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 URL pointing to 'nipisod.ru', which is presented as a 'General solution calculator'. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload. The presence of multiple unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/123?utm_term=general+solution+calculator+symbolab
    • http://ruwemipuwev.mypressonline.com/skyjack_3219_ops_manual.pdf
    • https://cdn.sqhk.co/bogovureg/pBkc2gf/rupepozigirekezufezimala.pdf
    • http://jekeluxuto.mywebcommunity.org/2010_camaro_ss_for_sale_los_angeles.pdf
    • https://cdn.sqhk.co/tujarazimok/ibZSdsO/bagezidabokagumu.pdf
    • http://kaxavetaxudu.mywebcommunity.org/tokyo_ghoul_season_3_intro_song.pdf
    • https://cdn-cms.f-static.net/uploads/4390381/normal_60360c8d6a6d1.pdf
    • https://cdn.sqhk.co/kibutonap/f5vfGAQ/ea_sports_ufc_1.pdf
    • https://cdn.sqhk.co/kumotuxijufu/jjFMdeN/free_online_bubble_shooter_games_to_play_now.pdf
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5ff2bb7e73cd4.pdf
    • https://cdn.sqhk.co/vazoguzo/igHejhh/bomodatidovanuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6e861ebe-9c7b-4e90-88e2-8d87fc91a42b/60354897795.pdf
    • https://s3.amazonaws.com/xilasisefi/ascetical_and_mystical_theology.pdf
    • http://vakizonozajaxe.onlinewebshop.net/sobalonat.pdf
    • https://s3.amazonaws.com/pexodugosa/w3schools_python.pdf
    • https://s3.amazonaws.com/timeziso/reportable_jurisdictions_definition.pdf
    • https://s3.amazonaws.com/paxuvagal/73896355293.pdf
    • https://uploads.strikinglycdn.com/files/aab6d161-26c9-4dd3-ae4f-a523e3f135c3/best_android_programming_language_2020.pdf
    • https://uploads.strikinglycdn.com/files/f479b3df-3e18-4937-a238-2ad3e40f1aae/what_is_the_hunger_games_mockingjay_part_1_about.pdf
    • https://uploads.strikinglycdn.com/files/cdfab914-1250-4452-81d2-cf5a42ac649d/wabumop.pdf
    • https://uploads.strikinglycdn.com/files/19501235-83d8-484e-a972-a9ed28c94257/pokemozajimofulixu.pdf
    • https://s3.amazonaws.com/belopudevuzuza/44762848763.pdf
    • https://uploads.strikinglycdn.com/files/db87813b-1114-4e12-9b9f-b14f8ca541c5/samsung_wf42h5200ap_a2_service_manual.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43c.bin
cf497603359f1e4b3b3c5333e66738a172a7edf774831d61f2c3264959623b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 5220 bytes
font_01_sfnt_off000105f0.bin
7249e15ab47524b7a13955dce73c883343d7f97a8236c90f2fae5c8ea6f234a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 11164 bytes
font_02_sfnt_off00012c5d.bin
ae4c1039909c6b18400a693790947520403f0a9c3cdc5bdc37254682f4165006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 16080 bytes

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