Malicious PDF — malware analysis report

Static analysis result for SHA-256 329ef9012a52108a…

MALICIOUS

PDF

75.8 KB Created: 2021-03-31 22:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4f367b9e6e4f46f0f946ab49094f091a SHA-1: 9d8a9522ae4558e1bf38830e34d52ae62222f263 SHA-256: 329ef9012a52108a46e67b61b3c6cfe601c821cb06ad99d1696c1f8466915fe5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm used for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/award?keyword=assessing+writing+skills+pdf PDF link annotation
    • http://gigurokubi.66ghz.com/7923569887.pdfIn PDF document text
    • http://steblin.pro/2370532419mxuau.pdfIn PDF document text
    • http://zifasito.22web.org/gutiper.pdfIn PDF document text
    • http://sosujinoriwi.22web.org/fiio_x1_ii_specifications.pdfIn PDF document text
    • http://zolugepusesotuj.iblogger.org/vupabevepulifixozur.pdfIn PDF document text
    • http://rte-ita.fun/pedalevd93no.pdfIn PDF document text
    • http://help-verification.com/99528347653l0chm.pdfIn PDF document text
    • http://thehensleys.org/tc_helicon_voicelive_play2k2pn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_1f2b8cf4dca44406aa37edfc16cc1ffe.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_c989c0aded244606b2f9a0d36cc1dabc.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_d24a1420d27b445fb21a15dd5a927f53.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_4c51e22f6df84d7b83dc4b98817dee51.pdf?index=trueIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_7ec74418d00a4525a0e0080d39d5df49.pdf?index=trueIn PDF document text
    • http://dupodege.rf.gd/zulaxebipesozof.pdfIn PDF document text
    • http://vofejobuvokare.rf.gd/dictadura_augusto_pinochet.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_d19e288da53949b8a2d303c5583d1a3a.pdf?index=trueIn PDF document text
    • http://velirixegu.rf.gd/pumumedesusalop.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_57f76b2797854d4aa6e59e6b59ecb8c6.pdf?index=trueIn PDF document text
    • http://gurunetotej.rf.gd/54236286127.pdfIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_012f35a66b054c67a08297aaf29ef50f.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_540527b3414d4024bc7cbd21b3c9af5f.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 5144 bytes
SHA-256: 8353d066df6fed2ce8f35a1cd5957f72537e0a06b016a1fbec45851aeac3482c
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 10616 bytes
SHA-256: ca0969c4a22b153434bc11d7f1ec3e823b8757c5297d731d11fd680a731eb5a1