Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e42d1c3420fb95…

MALICIOUS

PDF

89.2 KB Created: 2021-09-18 08:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18da8347c2bb6f34999ed875365a6c9b SHA-1: 44a29bcff2992ce66d4e33d04917a013dec541c1 SHA-256: c7e42d1c3420fb954315eb186014344e1629907009600a40942da12654716554
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=objects+beginning+with+n PDF link annotation
    • http://galerie45.com/userfiles/file/risutazof.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f112922aa---fezufopazejobokalurogaf.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/lulujiwukapoxuwikolumu.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/94562642427.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/78335742245.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/mulepa.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/68787791999.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/dapilupomuta.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9ab9e03e8cd6a5b8b7f67d7d3e8b4345/77974688101.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vebubivopigetuwokuzer.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/52565287793.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/23720013807.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/82213911939.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/56166635897.pdfIn PDF document text
    • http://gibisch.org/files/files/68592045634.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/44507410096.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/vojerunetaruruzesodivako.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/xamoraxu.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/tevixakitiniweraxitemu.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/wotalonopudemilufivedas.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/mavutik.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210902054603.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/3755313500.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/62853085781.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_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 20056 bytes
SHA-256: 65ad6c38858f952f3f923cf20a015246407be8040977f4b19d0cd893c4f0ac98
font_01_sfnt_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 10464 bytes
SHA-256: 9e06250b1e703541fd85ac48c79b0cd5140afb7356103b0bd6b363c589f680d3
font_02_sfnt_off00013f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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