Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb45217bd42262c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-10 18:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c767d0b7058f42cc69ac0704dc8d6627 SHA-1: 9943ee03c3cf9a049365d83b3376dae0e35c1812 SHA-256: 1fb45217bd42262cea7dcc1ba58eeb932f4da0e0616f7c8b165c109965928f6f
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on disposable domains. The presence of many unknown URLs suggests a broad distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://calienglish.com/ckfinder/images_store/files/83855762657.pdf In PDF document text
    • http://southerncross-ex.com/images/blog/file/73973879331.pdfIn PDF document text
    • http://pasaru.com/upload/files/gusofowutitugejof.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/kadipedo.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/nelilumid.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/dunuguwewajitez.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/8695302719.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/lakopuvekes.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/xaxevekunotiduwisulosabe.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-3/20210903085908444420.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/45943696705.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/19d52c8b0060bb37de124a1c4f6370eb.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/5976257113.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/57078480405.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/dofikilapiretevili.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109052017493550.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/jatukaperif.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/28881985938.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/damopixesezewunezalajasef.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/wuweki.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/dobofadokamopijowivufeme.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/jajutozevizapeta.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/32718116969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=experimental+method+in+psychology+pdfPDF link annotation
    • 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_off0000b2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A1 15752 bytes
SHA-256: 640baf7c38d2e315dbfee45218867277c2fe9dd9f5a94f923a780efac7a73f63
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 11264 bytes
SHA-256: 5cbb201907f2c65cc795781117f2068659be469aacac03697877a1c69149c7c7
font_02_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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