Malicious PDF — malware analysis report

Static analysis result for SHA-256 a854ba108a49d210…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 13:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c253f9510d51ca19b820a549d96aa61f SHA-1: fbc9134e4db47c74f7a56b5edabb82b3a6f72849 SHA-256: a854ba108a49d2109672b76fac12ae5a35694beb1eea976e55b38374f11cd333
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF is designed to redirect users to numerous distinct, often disposable, domains. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://myshiou.com/uploads/files/202109040101105714.pdf In PDF document text
    • http://barexkft.hu/userfiles/file/wiwon.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/mabitojotekumedaluxatode.pdfIn PDF document text
    • http://sinostandards.net/upload/files/53468377013.pdfIn PDF document text
    • http://oodow.cn/upload/file/210909094335719572pfzwdsj3g27y.pdfIn PDF document text
    • http://skupka54.ru/upload/m/63022562607.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/46997956426.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/18873553410.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/56764874898.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210907_416338756250F2AE.pdfIn PDF document text
    • http://uco-kampen.com/media/files/xireguzef.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5d094df02aefdf60a693939be8844c18/lipexoxutabojekotav.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/22878591023.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vumatekawabexo.pdfIn PDF document text
    • http://vecsecity.info/editor_up/41025024588.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2242b333---30437491403.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/pigotul.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/7700767042.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/laben.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/83999589508.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/78884833018.pdfIn PDF document text
    • http://davcpundri.com/css/file/tuxasefemuvoxise.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/14965765348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=amazfit+bip+u+app+for+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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 18056 bytes
SHA-256: b10311dfef866ff7d2ef5b887d818d0f476e76a4f36bba92f55f0387eeea4e6c
font_01_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 10596 bytes
SHA-256: e09ea0502a59148905477130145a72b5a0e8725e49c6f563615979a3629082a9

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