Malicious PDF — malware analysis report

Static analysis result for SHA-256 095c4d8f4b611225…

MALICIOUS

PDF

72.9 KB Created: 2021-04-01 13:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eb95d42375aa553337c88f4f6dae299 SHA-1: 374cc2e1049f78dfe5313968213b96198d25f106 SHA-256: 095c4d8f4b61122539a1bc6c461964deae52ed75ed1984ea7f1b59a39c04c28d
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The primary URL, 'https://jacksth.ru/strik?utm_term=4th+grade+math+multi+step+word+problems+pdf', suggests a lure related to educational content. The presence of a large number of external links, many hosted on disposable domains, indicates a likely attempt to redirect users to malicious sites for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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=4th+grade+math+multi+step+word+problems+pdf
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/9286260.pdf
    • http://botanilix.mygamesonline.org/kaban_s_protocol_for_tmj_ankylosis.pdf
    • https://cdn-cms.f-static.net/uploads/4417418/normal_602be35f8cbf6.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/2478516.pdf
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/7182834.pdf
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/pelel.pdf
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/3308fdf1e2c12.pdf
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/zonivemiwan-zemof-ketinerano-rofejuvutil.pdf
    • https://cdn.sqhk.co/xivudebisov/bijidje/haunted_tunnel_in_ohio.pdf
    • https://cdn-cms.f-static.net/uploads/4471686/normal_60300335aa6d2.pdf
    • https://cdn.sqhk.co/pabefidinaz/ySuiiVu/32143752797.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://madepadejatutof.onlinewebshop.net/autodesk_revit_basic_tutorial.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_caa910ad389f4d51ab8e00755add705a.pdf?index=true
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_be54ace4a2624c11ba127b86a875a9f5.pdf?index=true
    • http://dexadusoxeb.atwebpages.com/bapupitaxugoxodujamufe.pdf
    • http://zenakezogutomu.onlinewebshop.net/best_ebook_reader_2020.pdf
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_06019b573a234f9aa7f6ba9c50fa783d.pdf?index=true
    • http://nogafojomor.onlinewebshop.net/rudoxagimuvipotawif.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_off0000e018.bin
40ee73bfd0060e6401cd6b99fc72c664d11214c490d93632c5672e6759d2e876		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 5680 bytes
font_01_sfnt_off0000f34d.bin
f295ae2f50f931d92413c3f1be9c5eb6422c289ce69bfd184b8cd66dd4dfe4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10144 bytes

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