Malicious PDF — malware analysis report

Static analysis result for SHA-256 821aa7809afc167f…

MALICIOUS

PDF

77.0 KB Created: 2021-06-11 09:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dd8601355fee97cab247e43c02aa3f07 SHA-1: 20eb3a9082d6d6e546cfb5fb2d100d58e11234bd SHA-256: 821aa7809afc167f08c0e89db5ecd1d675ff3c73ebc8638302c4ae8b9c812ad8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a significant number of external links, indicating it functions as a link farm. The primary purpose appears to be directing users to various external websites, potentially for SEO manipulation or to host further malicious content. No scripts were extracted, but the PDF structure and link farm heuristic suggest a phishing or content-distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pistant.ru/pbw?utm_term=gerudo+language+translator PDF link annotation
    • https://xokotenesuku.weebly.com/uploads/1/3/1/4/131438709/tomorodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_606733bb5d418.pdfIn PDF document text
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/241e38c2a.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/d63fd0dbda1.pdfIn PDF document text
    • https://fevupadijedip.weebly.com/uploads/1/3/1/4/131407665/nupitakaduzabu-vijejo.pdfIn PDF document text
    • https://besekexedonake.weebly.com/uploads/1/3/2/7/132741764/26744473a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_605fde9099bf5.pdfIn PDF document text
    • https://panibatolabixoz.weebly.com/uploads/1/3/4/7/134720971/3f586e217.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://gisugakeg.pbworks.com/w/file/fetch/145111542/bewuvevifafinudokaxoludej.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/xabonoze.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144536886/what_percent_of_mksap_to_pass_abim.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/w/file/fetch/144521496/evil_nun_1.4_3_outwitt_mod_apk_download_link.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/fast_and_furious_9_in_tamil_full_movie_download.pdfIn PDF document text
    • http://vonodatob.pbworks.com/f/ratios_and_proportional_relationships_7th_grade_worksheets_answers.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/finding_lower_bound_and_upper_bound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8087af50-efa8-490f-ac0e-c6a3b6368df5/danby_portable_dishwasher_ddw621wdb_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3ee5ca-c403-423e-bfd9-ebca906a5f5b/what_are_quantitative_methodologies.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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 4860 bytes
SHA-256: 46a5796cdbd8b094170d06b792eb4b79fc8d14049a279bb162580b69c7b04f02
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 10852 bytes
SHA-256: 285fabdec79892af06f8c09f513cbcee690ee84d5c490a80c5446f07316b6994
font_02_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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