Malicious PDF — malware analysis report

Static analysis result for SHA-256 1700b72ee90f311b…

MALICIOUS

PDF

74.9 KB Created: 2021-06-09 18:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce1110de0491015b3b66f2016f9d7a1f SHA-1: d267ea60a789e7c976cea84ad5168ed4f396d2e7 SHA-256: 1700b72ee90f311b246d895362f31b2508b97c69a6198a2ea421d2ac0a72762a
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 0.9996

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://queure.ru/pbw?utm_term=worksheets+on+vegetables+for+kindergarten PDF link annotation
    • https://lawilutimi.weebly.com/uploads/1/3/4/8/134879912/0d5235f52ab018d.pdfIn PDF document text
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/rawiwaf_mubenadu_rojiga_kizazunukurawos.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/budurugamiroxekulifo.pdfIn PDF document text
    • https://nugenezeni.weebly.com/uploads/1/3/4/6/134632238/6451c72.pdfIn PDF document text
    • https://totofogekof.weebly.com/uploads/1/3/5/3/135327731/lisesanoxedowog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_6058e2b5c7e33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500674/normal_5ffbcd727198a.pdfIn PDF document text
    • https://notebatamigoxaw.weebly.com/uploads/1/3/4/7/134715817/2770f0d.pdfIn PDF document text
    • https://vamewifajezik.weebly.com/uploads/1/3/5/2/135297159/senepunojudof-jukaledilamemaf-bokivurujujapib-fufasor.pdfIn PDF document text
    • https://bibikabefome.weebly.com/uploads/1/3/5/3/135392895/6538972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_6061012b29144.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/lixitusoped_vobevel_tegokafelomadif.pdfIn PDF document text
    • https://wunenogapo.weebly.com/uploads/1/3/4/5/134509221/tevim.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/9600974.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/zudovuru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_604d23db3adbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawepiko.pbworks.com/w/file/fetch/144544785/zamexojobobavega.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144953670/liperef.pdfIn PDF document text
    • http://tosuvop.pbworks.com/w/file/fetch/144699537/40024908115.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144599982/how_do_i_unblock_a_number_on_my_panasonic_cordless_phone.pdfIn PDF document text
    • http://wodotazisib.pbworks.com/w/file/fetch/144751863/8657164178.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_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 5444 bytes
SHA-256: 34761e9010e4ea91baf92ecd8ae78421e7f56b97daed54c84ed6fe77ce1fa9ce
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 10400 bytes
SHA-256: 4469e4e63cfbbd9fa7b1ac9cea5f095e758e9d5eb141b495b4902300934a2cc1