Malicious PDF — malware analysis report

Static analysis result for SHA-256 50557ddc699989aa…

MALICIOUS

PDF

76.0 KB Created: 2021-06-02 06:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 46b3a79d993e309ea502facce55c11ca SHA-1: 55390d30bd988c6a179229b7c485a98548387a10 SHA-256: 50557ddc699989aa313c5b1c8b2d120e62e89192302f43fc21029f08edb0d4a0
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('coretry.ru') that is likely used for phishing or to serve a second-stage payload. The PDF structure and the presence of external links suggest it's part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://coretry.ru/pbw?utm_term=vusamazulu+credo+mutwa+books+pdf PDF link annotation
    • https://tewenamizudeko.weebly.com/uploads/1/3/0/8/130873709/ae018505c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424027/normal_6054b8bf11e09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5feefe4f825a6.pdfIn PDF document text
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/9164820.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/3867538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6034dd82a2bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472506/normal_6060136e7f3e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_605f663b04e28.pdfIn PDF document text
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/6601855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370056/normal_5fe57d66a3d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426549/normal_60503d05c5c15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biduzoku.pbworks.com/f/29592447605.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/w/file/fetch/144449487/dynamons_world_mod_apk_1.5.3_unlimited_money_download.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/sulatutuzabunadugodujivi.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/50989855438.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422670/rukaxodegepofamopigi.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/w/file/fetch/144418716/teri_ungli_pakad_ke_chala_mp3_song_download_320kbps.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/graco_baby_delight_swing_batteries.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144474615/79391387691.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144486408/tamelizupemuzokemurokijes.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/vogelhaus_blockhaus_bauanleitung_kostenlos.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 5612 bytes
SHA-256: 04258cc022ed9ac33ec40320ef044c9eeaa84f0137176994ea0578ce91ea2480
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 10728 bytes
SHA-256: 4147fb407144bcd4fdc035dac0df5d0e2374bce65f2f13f9d477d44d5ab527b2

Open this report in the interactive analyzer, or submit your own file for analysis.