Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb528bb167acb68d…

MALICIOUS

PDF

77.0 KB Created: 2021-03-16 13:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ff8bd0a6b04702f5cac4bcab8bb2cf60 SHA-1: 28a4957db429abac61eac9b8ff69a815ee42a2e1 SHA-256: cb528bb167acb68d91ee7370a70aab561ec8ac490c3c0c2a98b9b3e324db525e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded URLs point to suspicious domains like 'dugedepap.ru' and 'donoreto.weebly.com', likely serving as lures for further malicious activity.

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://dugedepap.ru/strik?utm_term=meade+autostar+497+ep PDF link annotation
    • https://donoreto.weebly.com/uploads/1/3/0/9/130969624/jagixunalujo-pekofi.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/b85e9713988be40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_60004fb19d0a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_60177c568544c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_602e429f4e01e.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/vijlohh/dudifewamevoluluxew.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/kijusopiko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_5fcc5680e6bfc.pdfIn PDF document text
    • https://giloxegikejuzun.weebly.com/uploads/1/3/4/7/134712531/ralotariwifusoz.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/lobenexirif.pdfIn PDF document text
    • https://nobasaxekomu.weebly.com/uploads/1/3/5/3/135322761/39d915c7fca26ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_6025c727cdda8.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/dipijaj_xotegowizan_fozitilixitekuv.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/cTYyJAP/bulikuvexog.pdfIn PDF document text
    • https://cdn.sqhk.co/zogaxokeno/jGhilW5/abc_phonics_sounds.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/surisoba_bafetodotutad_fufewat_tovimodor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/training_attendance_record_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d55fa2f-c743-4366-bda8-e1c0c513dd88/21830629673.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/bd139_datasheet_st.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/xasadojedekeruduva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779dce12-c24c-488e-afb0-1247f1190c37/18192618676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f605f6-0001-403c-9f7d-dd6dd21c706f/bass_guitar_fret_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5279ceeb-0378-41bd-a977-ab34e2acb02a/nijodepuwowijades.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_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 5252 bytes
SHA-256: 1d1ebb21a1a1331ced5dd5637ceefac28f910e42ead31686046bf774c99b1187
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 11376 bytes
SHA-256: d6dde218d920396f99b3e052951a3d780b5a654f54a73ad72d67445a4e7eec22