Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b056ffee40d610c…

MALICIOUS

PDF

86.6 KB Created: 2021-10-09 20:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 1fe35deff5951a93c342198308d06cd9 SHA-1: ab176c178b3e7e3f160bafcf14f6e5bd0c155744 SHA-256: 1b056ffee40d610ccb84bacc7161a807caecf94d857fa0055ac55ca64085dc5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these are part of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=main+function+of+cardiovascular+system PDF link annotation
    • http://dokturmice.com/ckfinder/userfiles/files/texogukuru.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/tesari.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/56712104235.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210912062328018595595fob08covw.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/61531651062.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/81256695194.pdfIn PDF document text
    • https://rotitelor.com/contents/files/jovagulef.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/30013788627.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/73592304601.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/jimukibu.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109170155381711.pdfIn PDF document text
    • http://moristas.com/userfiles/files/63828756280.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kosovujawafaxarubido.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/zariko.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/20652681047.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/jixoxitewotixadukimezi.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/bojopu.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/22214358125.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/1874192927.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/14057709613.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/61977978012.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/fixuniwuvuri.pdfIn PDF document text
    • https://akemi.ro/hirek/file/20451286087.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/89315451417.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_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 18896 bytes
SHA-256: 28732d02b61eca7f2308da2db6407354068ee02b0b79608170fe000a71dee736
font_01_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13330 10908 bytes
SHA-256: 26231816c4d02331fe1e4158f8491a62919d6f03ab217ec248513a9fbf702e8d

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