Malicious PDF — malware analysis report

Static analysis result for SHA-256 9966b89c64dd526a…

MALICIOUS

PDF

84.6 KB Created: 2021-03-17 03:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3241211e9b9fd4f3c057ceaaced6c40 SHA-1: 738d66e202ff27c2ec26a254a8b3d6637b425952 SHA-256: 9966b89c64dd526a70f8fb7f2c3b012bdc7ee23739c2ccd314fddcd16d0ecacd
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, including a link farm heuristic firing, suggesting it's designed to redirect users to potentially harmful websites. One prominent URL, 'https://jacksth.ru/strik?utm_term=adobe+premiere+pro+free+text+effects', appears to be a lure, possibly to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=adobe+premiere+pro+free+text+effects
    • http://mamontov-net.cc/votunivosemajedizulgqgtw.pdf
    • http://fipagolanikobax.mygamesonline.org/what_are_some_sight_words_for_kindergarten.pdf
    • http://runmasten.online/ejercicios_de_nomenclatura_de_oxidos8n1u3.pdf
    • http://tikanaw.mypressonline.com/marriage_and_morals_in_islam_sayyid_muhammad_rizvi.pdf
    • https://cdn.sqhk.co/vufisolepu/XdIGNSg/rutew.pdf
    • http://flylovel.com/359554895681yb39.pdf
    • https://liberiloro.weebly.com/uploads/1/3/4/5/134589576/4846598.pdf
    • https://cdn.sqhk.co/jenojigise/V2WEcig/58574701403.pdf
    • https://cdn.sqhk.co/sekigizakeku/ihhbhde/easy_homemade_chocolate_cupcake_recipes_from_scratch.pdf
    • https://cdn.sqhk.co/siganewita/jiicWhg/sopalalu.pdf
    • http://iciapp.xyz/wizard_and_warriors_3_nes_rom3xl59.pdf
    • https://cdn.sqhk.co/novigigexuxo/J2hdcKj/how_a_falling_ball_viscometer_works.pdf
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/418225c035ef.pdf
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/fd7be3d87a458.pdf
    • http://smirno.life/bone_marrow_aspiration_and_biopsy_proceduresowdh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dibedamoka/ladurasobivetinopo.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/best_android_phone_under_10000_4g_volte.pdf
    • https://s3.amazonaws.com/rujimidujek/sonumivozuwotavovexid.pdf
    • https://s3.amazonaws.com/nagev/convert_outlook_calendar_to_file.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/kexivejejiven.pdf
    • https://s3.amazonaws.com/bulikowexunepov/wodunoxoze.pdf
    • http://zuzopejorexa.onlinewebshop.net/waktu_solat_pulau_pinang_2020.pdf
    • https://s3.amazonaws.com/muvemasoxaji/80250855227.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010088.bin
60b4350bcf291af1a7776b1d28cd0c2e95bce0eb93608cdb9e699ca96c79f5a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 4940 bytes
font_01_sfnt_off0001115a.bin
fa91a8e415a8887005fbe5c2055f95ff93a0871265775f649b279b1889fcbce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 11084 bytes
font_02_sfnt_off000136d4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 4324 bytes

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