Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad164a9390b79b70…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 03:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3beccb0933de8df4e1ce31314e482647 SHA-1: adaa89dc1a3f07073580142574bfdfa2e29b66c9 SHA-256: ad164a9390b79b7082df2b40ff1f818c82af42dbd74d139fb66e70fbd9072094
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--z92bzy85x.com/userData/board/file/68398323761.pdf In PDF document text
    • http://border-collie.ru/sites/default/files/file/20388550766.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/55165217621.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/mesoxewa.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/jopatoleminuxatoli.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/072d7d294c25962edaad3be093edf5f8/55322917263.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/surafejo.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/gesuzivexuveposepoliririb.pdfIn PDF document text
    • http://becucci.it/userfiles/files/78965319191.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/gatibobijatu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/zobidulumukaxir.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/59761388927.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/damipunojumasakamibajo.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sapuzut.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/23159299367.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/33493374625.pdfIn PDF document text
    • http://industrialdevices.in/uploads/66989510479.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/83651419154.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/zuzalezuju.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/lotazoremok.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/disusubezed.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/sewugafe.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/mekumakozixanolakafi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1337f0e99427d6470becda172329c1f7/siniginenewapik.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/6775865407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wordly+wise+book+8+lesson+17+answer+keyPDF 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_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 18512 bytes
SHA-256: 9703a2e39a2aa50aaf98e39aea30a12b96adad2e11eab1104730d534ed88c7bc
font_01_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13785 10876 bytes
SHA-256: 71adeef0c0168ff292ad0dc5530df951f679be981fcf1dfe8efe2cb1634811ef