Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c2478772dce149…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 06:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9747fcb33af4771cff3494911150b5f4 SHA-1: f0c36ef0c619e33dba4448c81fa207a2af611d8a SHA-256: c4c2478772dce149f3884d7deedd8e26ba2581a6761c0e6cb689e1d59f33e512
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a large number of embedded URIs, many pointing to disposable domains or IP addresses, indicating a likely phishing or malware distribution scheme. The presence of numerous links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=positive+word+starts+with+u PDF link annotation
    • http://piri-piri.pl/ckfinder/userfiles/files/kavuvuvomubakusufezil.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-21/20210921075814305519.pdfIn PDF document text
    • https://riwg.in/userfiles/file/gigixotu.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/58759513514.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/botebab.pdfIn PDF document text
    • https://beaszemin.com/files/25160643717.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xidukuramejo.pdfIn PDF document text
    • http://budka39.ru/files/kisumixabibe.pdfIn PDF document text
    • http://yoron.net/up/files/bamonajok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gulobamipora.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/donisewugidizaporuroxedu.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109090929176303.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/wedagatuzemodamivisiw.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/19389707914.pdfIn PDF document text
    • https://tl-systems.hu/files/files/80805648789.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/76912637890.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/65059732214.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/vinolabedodonugisosij.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/40049388104.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/92588516013.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161474a01f262a---sisolaxaf.pdfPDF link annotation
    • https://stomatoloska-ordinacija-rijeka.com/files/70497768964.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/mevaw.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.

FilenameKindSourceSize
font_00_sfnt_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 10448 bytes
SHA-256: 2ad60dec9e4b9398886cede98b92d3199d8e33e90e302a260c9447c84bb72a7c
font_01_sfnt_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 16528 bytes
SHA-256: 52f24379616b1aabc2994aad8e6ae59bd739a094db8d2e798eadee91b50847c2
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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