Malicious PDF — malware analysis report

Static analysis result for SHA-256 5087aab6f987882c…

MALICIOUS

PDF

92.0 KB Created: 2021-03-08 01:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ba5495d5d7a32cb3c364f85d0d46c122 SHA-1: d07df96d93f708a7ec076cbcac96031c68e1295a SHA-256: 5087aab6f987882cbc6da1de29f386229281a9536d5e20a69bec65fae9dea265
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on directing users to 'jacksth.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malicious redirection scheme. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://jacksth.ru/wix?keyword=the+millionaire+messenger+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368243/normal_60136c4da0912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_6026d65c950b7.pdfIn PDF document text
    • https://vowawekalumuz.weebly.com/uploads/1/3/5/3/135304311/1136913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418987/normal_5fc77c023392f.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/nususavike.pdfIn PDF document text
    • https://rolobaxomudozu.weebly.com/uploads/1/3/4/8/134887904/vivamabuwutamemapon.pdfIn PDF document text
    • https://gopiwalugase.weebly.com/uploads/1/3/0/7/130738825/dd37aa2.pdfIn PDF document text
    • http://suberubepuparo.getenjoyment.net/3825092212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477623/normal_6001bfa56aadc.pdfIn PDF document text
    • https://sonoxezepokamev.weebly.com/uploads/1/3/3/9/133999938/lujexiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wudazebej.atwebpages.com/navy_eval_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/kindle_book_format_to.pdfIn PDF document text
    • http://nogurinuzelajer.rf.gd/sat_reading_and_writing_grading_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/80646695639.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/39402213749.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/batarang_3d_printing_template.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/rinnai_gas_stove_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b3598a-87cd-4826-aefb-1d49a7ad428a/89699537086.pdfIn PDF document text
    • http://jaforafonox.rf.gd/fifty_shades_of_grey_series_hindi_dubbed_download_filmywap.pdfIn PDF document text
    • http://kibulirol.rf.gd/the_new_guy_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/vidmate_apk_latest_version_2018_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bedff1bc-40e5-4c02-ab70-cd74d8507666/john_deere_425_mower_deck_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ba8fc6-521b-42ef-b302-df55a32e63c7/kedozoveteduwigibudol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a709edb4-0df9-40cc-8445-10116db73c60/norcold_rv_refrigerator_will_not_work_on_gas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 5112 bytes
SHA-256: 18b07a82e56f7f2a499db0c5e6ca7ffb1757667ae2fc39b75c8ecf00e80e2747
font_01_sfnt_off00013039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13039 10644 bytes
SHA-256: 70ce7a0841372c296fb9e0f4e518a08668daaf5c0691cf466c7f51d31ec222b2
font_02_sfnt_off000154a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378