PDF malware analysis — malicious · d561aeb4109a993c

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 17:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: feb4d8bd5f2d1c06e240c982427faa30 SHA-1: 73f0aaddd27b830b6b0a3fe62ef6ca28a9ae577a SHA-256: d561aeb4109a993cd967e91ba4bcb0768bfbca39433f01186d1c5ea73dfa14c2

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a phishing lure for secret recovery information. The document contains numerous embedded URLs, many of which point to PDF files hosted on disposable domains, suggesting a phishing campaign. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used in such lures to redirect users or display fake forms.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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
Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE

Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
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/uplcv?utm_term=encrypted+pdf+to+normal+pdf PDF link annotation
- https://sbmhavacilik.com/userfiles/file/60554890654.pdfIn PDF document text
- http://cozycornerexpress.com/uploads/files/2887958125.pdfIn PDF document text
- http://mcenterdk.ru/fck_editor_files/files/26130556081.pdfIn PDF document text
- http://rulada.by/upload/editor/files/70353256128.pdfIn PDF document text
- http://dsraxys.com/uploads/82705725117.pdfIn PDF document text
- https://ultralloy.net/upload/files/25455687999.pdfIn PDF document text
- http://www.contectrade.hu/fckfiles/file/67445439902.pdfIn PDF document text
- https://chsins.tw/uploads/files/202109131421329142.pdfIn PDF document text
- http://pantanalmsnews.com.br/ckfinder/userfiles/files/ligarijabelot.pdfIn PDF document text
- https://baxsporthorses.com/userfiles/file/roxipatebivuxiruburebug.pdfIn PDF document text
- https://dichocungtoi.com/userfiles/file/25926824379.pdfIn PDF document text
- http://heyumpnd.com/userfiles/file///62890864760.pdfIn PDF document text
- https://perfectsextherapy.com/public_html/userfiles/file/lavides.pdfIn PDF document text
- http://plusdesignwebsite.com/userfiles/file/bulesemobakadegojetorow.pdfIn PDF document text
- http://rayocazar.com/images/elfinder-1.1/files/file/bidurukibomepinalegenoge.pdfIn PDF document text
- http://1careglobal.com/upload/files/9734237792.pdfIn PDF document text
- http://dachastyle.com/userfiles/file/69345243510.pdfIn PDF document text
- http://voijin.com/userfiles/files/5613422450.pdfIn PDF document text
- http://caerulumpharma.com/upload/files/66581090310.pdfIn PDF document text
- http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/80725747268.pdfIn PDF document text
- http://diagnosticaedilizia.com/userfiles/files/56440065455.pdfIn PDF document text
- http://synphabase.ch/upload/file/bejupekiz.pdfIn PDF document text
- https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/jadoku.pdfIn PDF document text
- http://fred-robin.com/ckfinder/userfiles/files/57783204550.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d768.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD768	10620 bytes
SHA-256: `6d4abb53e19b1874ca1e55d5a02187adf9324d8b96853ec3cce62106471ef10c`
`font_01_sfnt_off0000efb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000107c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107C5	17352 bytes
SHA-256: `7023aaf7a652896b0edc5cbe5fa12cc150744d97111a20683134b8bf653c4143`

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