Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb9b85d0d81a4da…

MALICIOUS

PDF

77.6 KB Created: 2021-02-22 21:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 48f41cfde38d14dcf3801698981a29c4 SHA-1: a5b4eb612e9a762a9903fb31eb139842614fada3 SHA-256: aeb9b85d0d81a4da434a7feb72d6e1a4b07b576a814a625aed4546c9d8c5d5a5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'endocrine system case studies worksheet answers', indicating a social engineering pretext. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest malicious intent.

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://jacksth.ru/wix?keyword=endocrine+system+case+studies+worksheet+answers PDF link annotation
    • http://pitushok.fun/color_jellyfish_tattoolvwgu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465403/normal_6005271d4c088.pdfIn PDF document text
    • http://covid-19online.site/condensing_files_for_emailapdwk.pdfIn PDF document text
    • http://euroshopme.site/zefugidavadimabarezipixo47mnu.pdfIn PDF document text
    • http://fherixq.com/academic_writing_from_paragraph_to_edi4q4.pdfIn PDF document text
    • http://devlp.club/wintv_v10_activation_codeujern.pdfIn PDF document text
    • http://mybiol.site/552637131210tcit.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
    • https://s3.amazonaws.com/xonobijikivo/28107498330.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/ishikawa_diagram_template_powerpoint_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/hip_hop_dance_stunts_free.pdfIn PDF document text
    • http://desuvusemexemob.epizy.com/65244648058.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/1549288419.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/frere_jacques_free_piano_sheet_music.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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5244 bytes
SHA-256: 362e196fff52d8ed438a6aedbbbaa355c019602a1cb030f7aa1408483c21bdc5
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 9892 bytes
SHA-256: e661137dfd4affd08bd4d1fe3654dc5aaf032ed3967dba921e15ae9616134abe
font_02_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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