Malicious PDF — malware analysis report

Static analysis result for SHA-256 e518bf55d217a160…

MALICIOUS

PDF

72.5 KB Created: 2021-03-23 02:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ba7988ecdd5b5bec9025e3895815885 SHA-1: d4aff0cd0ad382aab02eb1314aab6216a961d9ba SHA-256: e518bf55d217a160b7f08beb14acf8bf9a3f4fa7ef7eb43d2a0a8de21e0dd6f4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/123?utm_term=dispute+resolved+reported+by+grantor+discover
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/zofabovuv-joruwav-sunizowajun.pdf
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5ff3916fb9bac.pdf
    • http://xufopizaxeto.medianewsonline.com/50339705279.pdf
    • http://bodaweziwov.mypressonline.com/66275442296.pdf
    • https://cdn-cms.f-static.net/uploads/4389366/normal_601d539b73f93.pdf
    • http://detodefinedex.22web.org/sawoterigorosil.pdf
    • https://sudoxelavekif.weebly.com/uploads/1/3/5/3/135305243/fufosuvanage_likunetesaxowaz_kusixitumarow_zotidewo.pdf
    • https://vijizonumek.weebly.com/uploads/1/3/6/0/136034009/9b8b0d4.pdf
    • http://mejumafegebameg.mygamesonline.org/6391194284.pdf
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/rikofuxawemuf.pdf
    • http://sejujanovemo.medianewsonline.com/ayushman_bharat_yojana_details.pdf
    • http://gapilojazixo.getenjoyment.net/what_is_lean_six_sigma.pdf
    • https://siwevobone.weebly.com/uploads/1/3/5/3/135317475/5398727.pdf
    • https://rovetizewi.weebly.com/uploads/1/3/0/7/130776299/5716903.pdf
    • http://wekanisa.scienceontheweb.net/beginner_guitar_lessons.pdf
    • http://nipikul.22web.org/94112639807.pdf
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/dd79ac1c6.pdf
    • http://duxinivodozular.mywebcommunity.org/creating_an_architectural_design_in_software_engineering.pdf
    • http://jixerusax.iblogger.org/51138394.pdf
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/rumaxikupixamiv_zekutipugaj.pdf
    • https://luzijegeze.weebly.com/uploads/1/3/4/0/134040843/mamusogeb-lunoxez-reruturog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kadoxosin.atwebpages.com/inteligencia_emocional_se_puede_ensear_en_las_escuelas.pdf
    • http://zaduzos.myartsonline.com/19147598398.pdf
    • http://tovukazemav.epizy.com/anari_full_movies.pdf
    • http://degununizezubom.rf.gd/how_to_pair_lg_tone_bluetooth_headset_with_iphone.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_off0000cbfb.bin
bf83a4ef5b4671db0120fdf0bc8af3933845c4da3de7465857d819fa9a0fc100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 5424 bytes
font_01_sfnt_off0000de83.bin
49553e276bbe5fe3af2fc0b2310f55d818ea87025ad539ecd6e0102d1133ff6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 11004 bytes
font_02_sfnt_off000103bb.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 4324 bytes

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