Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa0658b07d5b71d…

MALICIOUS

PDF

77.9 KB Created: 2021-04-09 01:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91d8998bc22b06774fe92b5fe5e921f2 SHA-1: e0bf75eb7231f0b32508c70aa2bcbd43a271699a SHA-256: 9aa0658b07d5b71dfd2fd9a770167be30ca123e111f239ed7eb1a46dd144a389
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on various domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 5

  • 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
  • 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://botokaw.ru/strik?utm_term=is+there+a+season+2+of+big+little+lies+on+hbo
    • https://cdn.sqhk.co/konajera/AGQcjji/xofajadajaxujaw.pdf
    • https://cdn.sqhk.co/donuvoduvedo/hMS5w1O/tamil_play_video_song_hd.pdf
    • http://fuxezaboxekave.scienceontheweb.net/maths_book_for_class_9_cbse.pdf
    • https://bezodidamivozel.weebly.com/uploads/1/3/2/6/132683328/4d4769f556b198a.pdf
    • https://ruzepekipup.weebly.com/uploads/1/3/1/3/131398244/xutafibamizolo.pdf
    • http://gallery-shop.site/duliwilixugovarixm42oa.pdf
    • https://dofisizowi.weebly.com/uploads/1/3/4/3/134327642/maluro-pujobat-daxedim-dazowuxunivu.pdf
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/situwajijudi.pdf
    • http://ruszaimclub.ru/android_studio_online_editorvbpjp.pdf
    • https://cdn.sqhk.co/lididiregi/hbdG5hf/7592482350.pdf
    • http://ledy66.net/rilivonevotatutuwr3xhh.pdf
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/woladifo.pdf
    • https://cdn.sqhk.co/kigaratak/cjOKJgi/33507560137.pdf
    • https://cdn.sqhk.co/fenazijeguk/eqkVhe8/96480418193.pdf
    • https://cdn.sqhk.co/bamebuxi/MS7jfq1/science_lab_equipment_list.pdf
    • https://cdn.sqhk.co/parabeset/2je0jgn/xidovo.pdf
    • https://rutuwupu.weebly.com/uploads/1/3/1/3/131378820/bipuwag.pdf
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/dd390748dc1.pdf
    • https://cdn.sqhk.co/bapuxilav/gfjsGIc/download_call_of_duty_mobile_garena_apk_uptodown.pdf
    • http://lapiwudoxavov.scienceontheweb.net/65085698693.pdf
    • http://216tilford.com/what_does_memento_mori_meaning_mac_miller990lv.pdf
    • http://vizilirudigub.getenjoyment.net/introduction_to_calculus_and_analysis_vol_2_solution.pdf
    • http://kenugizi.getenjoyment.net/79672108392.pdf
    • http://nowukusox.mypressonline.com/vikamotigegusezuxefujugi.pdf
    • https://cdn.sqhk.co/pajokiman/wrEnjc9/power_rangers_legacy_wars_character_codes.pdf
    • https://cdn.sqhk.co/xufaribo/eS9hiic/color_by_number_halloween.pdf
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/6424c3efbf2.pdf
    • https://nufomesamibu.weebly.com/uploads/1/3/5/3/135332564/lofularetaji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f318.bin
270472677008754a1417e223876dafd2f6f2d7d2a1ff3ade1fdbbca0308bbd95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 5236 bytes
font_01_sfnt_off000104e4.bin
edda2cfea94646911fe98db9ce35c9fa303e6405c4b061538c2246d1995fc275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 10940 bytes

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