Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fdfd9227110e70…

MALICIOUS

PDF

80.0 KB Created: 2021-03-02 06:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c69df09e71f2bae427ce03e965c106d6 SHA-1: 9b22f5b1a25fd37f3166540936272c04eac1c0d0 SHA-256: e8fdfd9227110e7048a7d75a852d744915b0ee8d84c0cba7ec4bcb7ecb228768
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/123?utm_term=acer+aspire+e+15+e5-575-33bm+battery+replacement PDF link annotation
    • http://naturaleone.space/lefuvubonnovgt.pdfIn PDF document text
    • http://meetcabinets.xyz/dialectical_behavior_therapy_worksheetstuve0.pdfIn PDF document text
    • http://filmera.ru/79927105394pzv8z.pdfIn PDF document text
    • https://tezijetukiresu.weebly.com/uploads/1/3/5/3/135394197/8592270.pdfIn PDF document text
    • https://xazowivuxef.weebly.com/uploads/1/3/4/5/134513065/8242936.pdfIn PDF document text
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/tokuwurevesobojilalo.pdfIn PDF document text
    • http://detonic-hypertonie.website/hotel_night_auditor_job_description_templatecdowc.pdfIn PDF document text
    • http://okrasote.info/nudagusosolenyqk7.pdfIn PDF document text
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/d6adc70479b3.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/4718077.pdfIn PDF document text
    • https://fosisejabevenot.weebly.com/uploads/1/3/5/3/135398983/6324465.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/gotekapezabur-venokipu-dezoretenoluf-moluzibu.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/5158119.pdfIn PDF document text
    • https://jojobejuw.weebly.com/uploads/1/3/2/8/132815094/03074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabaxaroxofujo.epizy.com/art_wallpapers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/website_to_see_chegg_answers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/coursera_machine_learning_andrew_ng_free.pdfIn PDF document text
    • http://rigirulame.epizy.com/88159493677.pdfIn PDF document text
    • http://nipinukajuxude.epizy.com/jurassic_world_4k_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/business_english_vocabulary_exercises_online.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_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 5764 bytes
SHA-256: 07d5d1605197c708fa371f96c4f128d71f22a4147e413ca30eb0e49d5d000c5d
font_01_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 10760 bytes
SHA-256: 38741463191220bb873b82afb8292758607add784e224d87630eb58ce8a1e549

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