Malicious PDF — malware analysis report

Static analysis result for SHA-256 dceab95fa8845cc8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 14:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7829911b68d7c81f3fa335695d5957fe SHA-1: 27241551a7a4a58c59f059fd0eb11a350f6ef477 SHA-256: dceab95fa8845cc839520497e2f516d216b95beee0238bf8fd38a7986ad23007
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF's primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://musorcentrum.around.hu/files/article/file/gazugasokabunoxawur.pdf In PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/xisitupejiritixefemolin.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/duzotamegitunudidinadusu.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/mizudipukuxirop.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/45747226083.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/32394958493.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xipilulam.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gusukekalukonunedu.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/nuvelumuvunalut.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/72615899977.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/telajobipekulotuke.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/8179434252.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/ritataje.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/25593904366.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/wovasapumizazezubalonez.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/disuxubizumukuzavoxuvu.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vujunilimodidomerewelewu.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/81653229478.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/17449041489.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/zosejasol.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/detusasijojojax.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/68227227222.pdfIn PDF document text
    • https://educhina.mn/editor/files/zugidajuwelutusuwafubewe.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/pedezosumulole.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/nosepulejedes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=online+vertex+calculatorPDF 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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 10348 bytes
SHA-256: d681b2e504d675cf783ac63223a771fd122b85d8bd80256f86df95941d690b3d
font_02_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 18540 bytes
SHA-256: 778ad839d3f4d1264bed32c34bfa6e7367f5ea8e28cd77df9f816d9884a316d5