Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8d9639e45cce67…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 09:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 07155a255f33b623d9d635bbde5664e8 SHA-1: 5d6b0433646813dfc1a84d860a0b92afa89189a0 SHA-256: 8e8d9639e45cce67c462d0224a01873aca772e7b6a7c01a6d447b75962aee355
186 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. 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 0.9956

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=how+to+set+thermostat+heat+in+two+story+house PDF link annotation
    • http://m-ryanaf.site/aisc_manual_of_steel_construction_allowable_stress_design52i3j.pdfIn PDF document text
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/9597475.pdfIn PDF document text
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/8889128.pdfIn PDF document text
    • https://linabodaku.weebly.com/uploads/1/3/1/1/131164293/sixenusideke-gotedufoj-nafiz-fudigobamawixur.pdfIn PDF document text
    • http://mosquito.codes/fejegewokewopexogunrrm98.pdfIn PDF document text
    • http://dabutaxezopis.iblogger.org/autocad_civil_3d_tutorial.pdfIn PDF document text
    • http://winoorama.fun/282415258363gsu1.pdfIn PDF document text
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/zegovuzi_kovimu_dujebajar.pdfIn PDF document text
    • http://scm03.ru/gawazuvvi168.pdfIn PDF document text
    • https://fibunijir.weebly.com/uploads/1/3/0/7/130740490/42bf76c5.pdfIn PDF document text
    • http://shopsupergood.site/95059956824jbgvt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0548f51-27ba-4eeb-a402-3babfe215227/what_are_the_rules_of_cricket_darts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d4615d-7df4-433f-a03b-290bc94afc6d/85858695175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51ee691-f283-4daf-8115-9310e685789b/57109571242.pdfIn PDF document text
    • http://doregupubufuve.rf.gd/xawesed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c40c0b2-5b80-48e8-b94b-d228826d139f/spanish_vocabulary_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8466b30e-e03e-4824-b21c-f19ff3d5855d/ejemplo_de_resume_de_trabajo_sin_experiencia.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_c2dbc51c56b448c8add97a307f0ede45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be29ea95-4ccc-477e-977a-53b1bb18e226/free_plan_drawing_app_for_mac.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_5cc0e78ea9cf4923b0cba89f78b9948e.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_ab1ada43420042f68c5502cfbe976977.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f32686-0483-4769-adef-a68dd5e3bb00/how_to_pair_skullcandy_push_ultra_wireless_earbuds.pdfIn PDF document text
    • http://nowesiredud.epizy.com/functional_requirements_template_xls.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_f6eaf2edf1fa4f15956e8b6307114a19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab0c82f-dedd-4a71-9f91-13ab69e5727a/kaxafilinuxobezibitek.pdfIn PDF document text
    • http://rofamotitasijud.rf.gd/wuxabepitejotiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387a270e-5473-4179-b142-a6865ad8f026/1958574515.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_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 5048 bytes
SHA-256: b4a088a36e7220ba3c6db2a2c05f354e38010deb50bafc21cf424f366448f00f
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 10348 bytes
SHA-256: 0cd455f7667412be4b0e1fe1ca413a131dea65627aad5fb15d79abe8d0ee1503