Malicious PDF — malware analysis report

Static analysis result for SHA-256 c739c87395f14a99…

MALICIOUS

PDF

175.0 KB Created: 2021-03-05 00:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c0bc4d61780ee82775d4dbc7c0ecafa3 SHA-1: 56ae807c6388f8c24f9cfbb0e70b135585705610 SHA-256: c739c87395f14a9926c757bbb7aaa890df90024f4c1084f383f720e80d6e9e22
184 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=2010+chevrolet+camaro+ss+rs+specs In PDF document text
    • http://national-verifyteam.com/54419097068ukoqd.pdfIn PDF document text
    • http://select-get.top/67247612578vu4st.pdfIn PDF document text
    • http://lnstagramsupportlives.com/kogejezapigasin9mx8.pdfIn PDF document text
    • http://dovavetupal.22web.org/muslimah_cartoon_picture.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/kujeso.pdfIn PDF document text
    • http://denizan.com/summertime_saga_guide_forest_puzzlevyd2g.pdfIn PDF document text
    • http://lozajakar.iblogger.org/how_to_unclog_krups_espresso_machine.pdfIn PDF document text
    • http://vukesis.iblogger.org/skyrim_how_to_level_up_smithing_command.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/why_my_panasonic_tv_keeps_turning_off.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/grimoire_meaning_in_arabic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/929dab13-a602-4beb-9dc3-2751c7066825/yes_man_jumper_song_lyrics_third_eye_blind.pdfIn PDF document text
    • http://fuwotatikiluwa.epizy.com/67055801500.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/9480561481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d73fa00-3c6a-4282-a53c-a5a96abfda6a/what_does_application_period_mean.pdfIn PDF document text
    • http://fofifalog.rf.gd/kuxaxepomaworaxolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae33911-c946-4027-9bf3-38714c3cacc0/derecho_procesal_civil_que_es_la_demanda.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/basanti_no_dance_hd_video.pdfIn PDF document text
    • http://pimifemegizak.epizy.com/fizebowukimi.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/traducir_de_ingles_a_espaol_google.pdfIn PDF document text
    • http://wejelinemadagep.rf.gd/davozoxerazixoziwuzal.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/internship_report_cover_page_design.pdfIn PDF document text
    • http://sugosabogakeg.rf.gd/83781941547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156f5254-fd42-47fc-a340-c33ebc4603a6/gomigafojukev.pdfIn PDF document text
    • http://wuzazuj.rf.gd/guwum.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/drukarka_epson_surecolor_sc-p800__roll_media_adapter.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000215c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215C5 15640 bytes
SHA-256: 18cc5ce170a9acf044c499737a9115657eb09958e86af8adb31b5ca655b57d04
font_01_sfnt_off000248d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x248D6 5096 bytes
SHA-256: 20abef3d2685eebe3518fad88c58bc82be3b21819ce21c268be2bf735ad6d5af
font_02_sfnt_off00025a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25A28 14904 bytes
SHA-256: 6ad662bbc7e82244c1efb1b6b3ba647cc86edb1efc73ece26e237b26a6470cee
font_03_sfnt_off000289cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x289CB 16088 bytes
SHA-256: 019e92530604f520106ad5c4b76966f1dd6ed19205c931d1b65f84b35f1178c0
font_04_sfnt_off00029e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E8E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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