Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae5a975af8c36cf…

MALICIOUS

PDF

77.3 KB Created: 2021-03-21 02:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1829d16353b74eafd333cc4a9416b462 SHA-1: 5cc0c11e8bc897f381a2b38b1b22e1363a31e4eb SHA-256: aae5a975af8c36cf1d2d23a2fbdcc4aec46678d50f6066b76b8e589f34fe25d1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The presence of these links suggests an attempt to manipulate search engine results or to distribute further malicious content to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=high+standard+sport+king+serial+number+chart PDF link annotation
    • https://mexubigewexuni.weebly.com/uploads/1/3/1/3/131384635/bezajufel-fadefedeguputan-renasov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fcba16b88b4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5ffeb8ad3e795.pdfIn PDF document text
    • http://vodabezoli.iblogger.org/interview_questions_in_java_programming_with_answers.pdfIn PDF document text
    • https://sepefawepuvikex.weebly.com/uploads/1/3/5/3/135384525/wovewe-vuwowaguwakazeg-wofuxuge-dewojexutetuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_60349b17a971e.pdfIn PDF document text
    • https://fitarerak.weebly.com/uploads/1/3/5/3/135313257/joreg-sodebupin-lavugiw-derubijurase.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/5521376.pdfIn PDF document text
    • http://sabawosekedap.22web.org/antisocial_behavior_questionnaire.pdfIn PDF document text
    • https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/pibuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_6024bd2a6ff6b.pdfIn PDF document text
    • http://benovezim.22web.org/flow_cytometry_report.pdfIn PDF document text
    • https://tusujowifavenag.weebly.com/uploads/1/3/1/4/131453847/mosido-pulizel-gojifazezapi.pdfIn PDF document text
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/vamoxibufoponubivu.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/gopefona_vepixepadijev_vekojirotup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_1db3c0b822e749e2ad877baed8776f67.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_cd18defe53814cf99caaab19652c2244.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_2641b99a5b2d4993aa712c2de377ba91.pdf?index=trueIn PDF document text
    • http://notilud.epizy.com/java_for_dummies_7th_edition_review.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_bfc5b65f57dd43c09729594b2ff38805.pdf?index=trueIn PDF document text
    • http://gabamad.epizy.com/top_paid_android_games_free_apk.pdfIn PDF document text
    • http://suzerukudatede.epizy.com/birarujuwowuruwufup.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_f12f8f9fa4d24937b74293b3ffdeb117.pdf?index=trueIn PDF document text
    • http://pekodumale.rf.gd/john_deere_240_skid_steer_electrical_problems.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_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 5652 bytes
SHA-256: 8b35fa7b689f4b9682872ca477a2837eff7aa537f11b3c6eaaeb2c4aaadeae0b
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 10660 bytes
SHA-256: e92071304e8fcbac7162c6d00692aca99dddbf713b6360e3d869419896838882

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