Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d71beb273493b2e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-30 00:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3ffd8697214b1f7c12faca8e5346458d SHA-1: 2873d07a4ce49e7f24bcbf7f5269fb998510640b SHA-256: 7d71beb273493b2e15e85f0d0131dbf77ef284a9a5068138d2a30cb88c4bd852
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that point to link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document as a link farm on disposable hosting, reinforcing the malicious nature of the content. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

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/wix?keyword=bloodborne+pc+download PDF link annotation
    • http://flebolog24.com/mupuvopodyjkj.pdfIn PDF document text
    • http://healthytrands.com/pujori5foze.pdfIn PDF document text
    • http://insurancecarusa.com/61523160476n663b.pdfIn PDF document text
    • http://gazozaxuk.getenjoyment.net/inhibidores_de_anhidrasa_carbonica.pdfIn PDF document text
    • http://igclienteam.com/delesekiwalobivufuxokariknkr38.pdfIn PDF document text
    • http://xufuzema.sportsontheweb.net/sebovigumezigunipadeb.pdfIn PDF document text
    • http://khanapoorti.com/arabic_into_urdu_dictionary0ytvs.pdfIn PDF document text
    • http://paktum.pro/list_of_aa_character_defectsnow2x.pdfIn PDF document text
    • http://e-devletodeme.net/how_to_start_life_coachingpeqdd.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/andrew_lloyd_webber_pie_jesu.pdfIn PDF document text
    • http://prizinsta24.online/why_does_my_whirlpool_washer_leak_waterdv6hu.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/comparing_fractions_with_unlike_denominators_worksheet_4th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gavigepovu.epizy.com/defozofazapab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5773ae8a-5401-449f-b1e4-456e630098fa/92716428771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2890e158-6ddb-4d6e-8aa3-cc21b68add81/90425674372.pdfIn PDF document text
    • http://bexisojulodu.epizy.com/accounting_research_topics.pdfIn PDF document text
    • http://polutojufet.epizy.com/arithmetic_progression_class_11.pdfIn PDF document text
    • http://foripoj.epizy.com/pet_rock_adopt_me_neon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1118ff9b-a098-4df3-a085-f36b24b49cb7/23734007698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7936e14e-4b92-496f-aec4-96e72ef4f231/what_is_political_discourse_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04f5200-0aef-4648-9704-836a79442463/the_book_called_thank_you_mr._falker.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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 5172 bytes
SHA-256: 041f19e0bd32e27ec2079fc6dbf9a6a6681d5b4dfe9071234d5bf033dabeccf5
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 11324 bytes
SHA-256: 15e71c4741b90c86a93b321c51cba680dbdebc4568be6e24806d5d75a3afc022

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