Malicious PDF — malware analysis report

Static analysis result for SHA-256 61feb3bc167e120c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 10:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b41568d33847b9dbc2ed9662b2928beb SHA-1: 5d957ee50187c681c817c8369621ec8cfa18328c SHA-256: 61feb3bc167e120c41aa7d14c873c959536e00741f563d555e4a82d71a64c62e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://nuestratierrapremios.com/campannas/file/ririgenuzedodajuvux.pdf In PDF document text
    • https://selispin.com/calisma2/files/uploads/xesusadatalatefo.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/gosomademer.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/xarebanonawoxujuwoje.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f44a3ed0---wolowobufonabegofovowet.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/tefele.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/36980038618.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/gimupasuxaresejovunotum.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/71968852717.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/79003277304.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161340a3665b83---96361698494.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/58457404042.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/wofijugufirotumitiwa.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/papudijebiwovejezuwive.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/37520445388.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/3175571420.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/6555890697.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/jabarilozigizogojufovoluk.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210910190821.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/59485187584.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/98574647803.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/73030432319.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/dedeburuwosasabunosa.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/4187810428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gun+3d+games+online+playPDF 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_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 10960 bytes
SHA-256: 187e78111b3d5ecb535426656fa3ca4e49c4df43624f6d24cd5236cb6609a7b7
font_02_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 18444 bytes
SHA-256: 613feebaf6d83076cc51b4afc75f88fb902c23cbea5f5b5013b4cb1fb0a11bed