Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3be7d6e6d9966b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 22:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5597b6d197b8b17404d402753cbd552f SHA-1: d9ea29b574936f641ecca2d542d15ef73394cab7 SHA-256: fb3be7d6e6d9966bdc415e7ccc9f27c001ab336fd8485cb99574ab48fe1415ab
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on various domains, many of which are identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://extremedriveline.com/ckfinder/userfiles/files/75426299111.pdf In PDF document text
    • http://medicamarsala.it/userfiles/files/kevebuka.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/dapovozoma.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/mizobigisipixibonade.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/40553940288.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/wedawiloj.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/naxowarajabewo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337ea6ef7d2---29976934526.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/20854910638.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/zazeg.pdfIn PDF document text
    • http://preiss.at/upload_files/files/4089002955.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/zetidevisudipufote.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/61422719299.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/sebuvizavasexuvofajuf.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/32682293514.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/dadikutuwematazuves.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9234819101.pdfIn PDF document text
    • https://grancom.by/upload/docs/gadig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0719d4400---vusaki.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/53078938896.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/tixefanimuko.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/bukozutatemikemaxu.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/27362221978.pdfIn PDF document text
    • http://abnicum.ru/files/file/jaminaduje.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/vinuxog.pdfIn PDF document text
    • https://airbays.com/userfiles/file/valesejome.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/tatepijim.pdfIn PDF document text
    • http://cwesp.biz/upload/file/36291735103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=where+are+my+widgets+on+my+androidPDF 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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 18768 bytes
SHA-256: f56835b09d670d8fcbf2e7b8aaa962c7155ac5b1886004bec9abf98e404c2bcc
font_02_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 10840 bytes
SHA-256: b1b5638f66b892769198ca2ce43d64be1b7da0cfa9c6a38c3fb96f6b250ad585

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