Malicious PDF — malware analysis report

Static analysis result for SHA-256 225c552770ff33b8…

MALICIOUS

PDF

86.3 KB Created: 2021-02-08 11:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0e3dc87d8e7c003619a109a352d6e898 SHA-1: 8de6cf7e490e992beddf6e2c8b6095692e2d2b4a SHA-256: 225c552770ff33b8cc6851399b7574067f5f2d337a8bc99cfd54d07a006959df
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to redirect users to various sites, including 'http://carbags.site/adjetivos_posesivos_worksheetmee8h.pdf', likely to host malicious content or phishing pages. The presence of embedded URLs and the overall structure point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/aws?utm_term=basic+computer+knowledge+pdf+in+tamil PDF link annotation
    • http://carbags.site/adjetivos_posesivos_worksheetmee8h.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/dbf2666455a.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/2fe34dfd.pdfIn PDF document text
    • http://rusagobaloregir.22web.org/sound_about_apk_apkpure.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/b57a40557f.pdfIn PDF document text
    • http://numusuri.22web.org/ellen_degeneres_queen_sheet_set.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/cambridge_igcse_mathematics975kv.pdfIn PDF document text
    • http://fruktovik.com/aromatherapy_advice_essential_oil_guide3h4nw.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/47637830911.pdfIn PDF document text
    • http://gawadatij.rf.gd/the_amityville_horror_full_movie_720p.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/vegetable_spring_rolls_nutrition_information.pdfIn PDF document text
    • http://girakes.rf.gd/jirukebosonito.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/ap_learners_module_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/us_army_dress_uniform_guide.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
stream_004_off00010217.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10217 15264 bytes
SHA-256: aa5397291b60ebb327f8cc8b2ac718a5eb6d20bd5d8c6265c9423c995ff88038
font_00_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 5680 bytes
SHA-256: d175c677de5605e8a7fa2b2f9f3d16efe191d0a1d2e46a70fc129667f79711b9
font_02_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 10952 bytes
SHA-256: c5c85da20172b44a470e381b9503ad3e732383cdcd4d6692b8b679819844b424

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