Malicious PDF — malware analysis report

Static analysis result for SHA-256 e165b679554bd34f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-24 06:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20721d2474985fa5bf714f773598e681 SHA-1: 954a1eb7de09aa1c60d22b66e2efe6aa9c696be7 SHA-256: e165b679554bd34f06428957ee862cdd60b97b61d34fcdb877499c40a12bfadf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external URIs, many of which point to link farms on disposable hosting. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is consistent with callback phishing or tech-support scam patterns. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to phishing or malware-hosting sites.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=handbook+of+manufacturing+engineering+and+technology+pdf PDF link annotation
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/loxabivakobejupekozela.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/pifatunoz.pdfIn PDF document text
    • http://storemisr.com/uploads/files/704063089.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/vejejefibevikiselit.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/38616149229.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/zomopejuzajeguzidiwez.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/nokedakoladomirumaxomipun.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210905_092531.pdfIn PDF document text
    • http://metallpress.ru/files/48100054196.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/29846750891.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/musexovuzalemikikabeju.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/pevirikubuselikepow.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/powokiralewazinitetur.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8sgi3e2h1ldhjd1sg170unqev8/82092216088.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/meravafijofagegidi.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/kufekunemuta.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/40799424557.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/2383636964.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fcca18ab1---rizuxupugimirovezixu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/62529105867.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/86516680864.pdfIn PDF document text
    • http://ty-int.com/files/files/guvofirobakenalaj.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90210825066.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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 17128 bytes
SHA-256: d280afd968a3777899800d01aca01ed22eb657b27c25def212b7b0a6d911a49f
font_01_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 11336 bytes
SHA-256: 91cef79f25fc28e0d2edbbf93eaad1cd472acd988deab779e85d960fd2d5542b