Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a002534f1919a23…

MALICIOUS

PDF

78.9 KB Created: 2021-04-04 07:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8183dced3ffa00106341179abb9e09b9 SHA-1: 528ce5f7ee02d1b7ab3c00ae067c8facc4d3185f SHA-256: 4a002534f1919a239b07df088a58d29a960078f5a0804a0002d586140612a4dc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/award?keyword=circle+equation+exercises+pdf PDF link annotation
    • http://nodururivaxekik.22web.org/candidiasis_genital_masculina_tratamiento.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/economist_cover_letter.pdfIn PDF document text
    • https://wugovaxovagebi.weebly.com/uploads/1/3/0/9/130969592/dibovizeto_kowekux_janibonikawigag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_6031dd84822e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_6047edb58cdb1.pdfIn PDF document text
    • http://panuxidoku.22web.org/html_for_email_signature_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_605d2405416a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_604389ea3df30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_600b69987faa5.pdfIn PDF document text
    • http://labebatazavanoz.mygamesonline.org/adobe_fill_and_sign_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_6058dcd8a8975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_6056523ae40c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_5fe8939b52ef0.pdfIn PDF document text
    • http://vixabaj.scienceontheweb.net/peremekunevafebuzozazep.pdfIn PDF document text
    • https://modemogip.weebly.com/uploads/1/3/0/7/130776314/fuwumupurujum.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/4b3de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_20605f561d30412892191d9e78ea822c.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_8fb4bdef38fa437e891ebfbd200335fc.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_2649b37eeefb42aaa1ce742a56690a40.pdf?index=trueIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_d4486ce31eab49e68c0ef77931e156f8.pdf?index=trueIn PDF document text
    • http://ribaxekag.epizy.com/74939360229.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_3db15fcb99954b7c9ce274d747580372.pdf?index=trueIn PDF document text
    • http://fomajunelafid.epizy.com/2002_polaris_sportsman_400_carb_adjustment.pdfIn PDF document text
    • http://fadajoja.epizy.com/bearing_housing_cad.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 5248 bytes
SHA-256: 8b41bbdf1a606d749b6121f312b763c72a1ec4ef3a5c75886029f21d0bf8bc91
font_01_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 11792 bytes
SHA-256: 0383dc9fb5f80761e789564990510db093b45ec50378b324ffa2a5874d75ed81