Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8806e352bc2700…

MALICIOUS

PDF

70.1 KB Created: 2021-03-12 13:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5b5df77c71889313a221b1a61dcd46da SHA-1: f32833abf453d99e57136557f7c2bd1c517aedd6 SHA-256: 5c8806e352bc2700ac9900729bcbb9589e21c259e569de4df2269d4cbdae4465
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://pelibifir.ru/wix?keyword=cathedral+of+saint+paul+bulletin PDF link annotation
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/4b1ece318d4e34.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/35518a6f8b09f.pdfIn PDF document text
    • http://stakingyfi.com/game_seperti_age_of_empire_android_offline6qxdl.pdfIn PDF document text
    • https://muxajugukeso.weebly.com/uploads/1/3/1/4/131453177/tadedojerux-razibajidap-nosesenuzerad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471988/normal_5fcea2676db1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_60126be90e356.pdfIn PDF document text
    • http://stepka2016.xyz/nova_icse_chemistry_lab_manual_class_9rz3vx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452834/normal_5fe1757f739c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_601f313458a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_60315e505090d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5fea310a2cc8a.pdfIn PDF document text
    • https://sebezubajisiv.weebly.com/uploads/1/3/0/7/130740163/xewur_tepuriruzalem_naxepilejeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_60143e98b4af5.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/gozutugot_baruxazuse_demezuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_6027904d5ce34.pdfIn PDF document text
    • http://naturaitalia.space/vuguniviodfa5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_286a9f61a2d4476c88dadc18c1dc42c2.pdf?index=trueIn PDF document text
    • http://xexapofibej.rf.gd/63402761461.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_19b2c76a9b3142918cd35f7e1a827ab2.pdf?index=trueIn PDF document text
    • http://talakukatutevib.epizy.com/texas_instruments_30xa_calculator_battery.pdfIn PDF document text
    • http://xuwiviw.rf.gd/flowchart_free_ppt_template.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_d4b960bfd5424886bbf103ce51643e06.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_450f677bf7ca4231bd436fe35fc64c31.pdf?index=trueIn 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_off0000cf67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF67 5176 bytes
SHA-256: 64e61f095eb57f9974f4b1f23e2794a7cbfe2790084cdfddc8df554b197ce31e
font_01_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 12940 bytes
SHA-256: 3051c641d0b9c3c27a00a68ade8211bf405e020d1731eaaa2d86aea717883606